TOPSHOT - A man, wearing a protective face mask amid the Covid-19 pandemic, walk at Chernobyl's memorial in Kiev to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - A liquidator of Chernobyl nuclear power plant kneels to pay his respects at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - Women wearing black clothing and face masks with radioactivity sign march under umbrellas in Minsk, on April 26, 2021, to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the tragedy. (Photo by - / AFP)

Belarus President Alexander Lukashenko speaks with local residents in the town of Bragin, some 360 km ( 225 miles) south-east of Minsk, Belarus, Monday, April 26, 2021. Alexander Lukashenko took part in a requiem rally on the occasion of the 35th anniversary of the Chernobyl disaster. (Maxim Guchek/BelTA Pool Photo via AP)

Belarus President Alexander Lukashenko, accompanied by officials, attends a requiem rally on the occasion of the 35th anniversary of the Chernobyl disaster in the town of Bragin, some 360 km (225 miles) south-east of Minsk, Belarus, Monday, April 26, 2021. (Sergei Sheleg/BelTA Pool Photo via AP)

Belarus President Alexander Lukashenko speaks with local residents in the town of Bragin, some 360 km ( 225 miles) south-east of Minsk, Belarus, Monday, April 26, 2021. Alexander Lukashenko took part in a requiem rally on the occasion of the 35th anniversary of the Chernobyl disaster. (Sergei Sheleg/BelTA Pool Photo via AP)

Belarus President Alexander Lukashenko speaks with local residents in the town of Bragin, some 360 km ( 225 miles) south-east of Minsk, Belarus, Monday, April 26, 2021. Alexander Lukashenko took part in a requiem rally on the occasion of the 35th anniversary of the Chernobyl disaster. (Sergei Sheleg/BelTA Pool Photo via AP)

A woman in a Ukrainian folk costume lays flowers to the Chernobyl victims monument in capital Kyiv, Ukraine, Monday, April 26, 2021. April 26 marks the 35th anniversary of the Chernobyl nuclear disaster. A reactor at the Chernobyl nuclear power plant exploded on April 26, 1986, leading to an explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

A Ukrainian army general lays flowers to the Chernobyl victims monument in capital Kyiv, Ukraine, Monday, April 26, 2021. April 26 marks the 35th anniversary of the Chernobyl nuclear disaster. A reactor at the Chernobyl nuclear power plant exploded on April 26, 1986, leading to an explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

Ukrainian honor guards stand to attention near the monument erected in memory of the victims of the Chernobyl explosion in Ukraine's capital Kyiv, Ukraine, Monday, April 26, 2021. April 26 marks the 35th anniversary of the Chernobyl nuclear disaster. A reactor at the Chernobyl nuclear power plant exploded on April 26, 1986, leading to an explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

A clean-up operation veteran wearing a face mask to protect against coronavirus pays respect to the Chernobyl firefighters at a memorial in capital Kyiv, Ukraine, Monday, April 26, 2021. April 26 marks the 35th anniversary of the Chernobyl nuclear disaster. A reactor at the Chernobyl nuclear power plant exploded on April 26, 1986, leading to an explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

Guards of Honor march to lay a flower wreath at Chernobyl's victim monument in Ukraine's capital Kyiv, Ukraine, Monday, April 26, 2021. April 26 marks the 35th anniversary of the Chernobyl nuclear disaster. A reactor at the Chernobyl nuclear power plant exploded on April 26, 1986, leading to an explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

Russian Emergency Ministry Soldiers attend a wreath-laying ceremony at Mitino Memorial to commemorate those who died after the Chernobyl nuclear disaster in Moscow, Russia, Monday, April 26, 2021, on the 35th anniversary of the explosion at the Chernobyl nuclear plant. About 600,000 people, often referred to as Chernobyl's "liquidators," were sent in to fight the fire at the nuclear plant after an explosion on April 26, 1986. (AP Photo/Pavel Golovkin)

A Russian veteran fire fighter lays flowers at the Mitino Memorial to commemorate those who died after the Chernobyl nuclear disaster in Moscow, Russia, Monday, April 26, 2021, on the 35th anniversary of the explosion at the Chernobyl nuclear plant. About 600,000 people, often referred to as Chernobyl's "liquidators," were sent in to fight the fire at the nuclear plant after an explosion on April 26, 1986. (AP Photo/Pavel Golovkin)

A Russian veteran fire fighter walks after laiyng flowers at the Mitino Memorial to commemorate those who died after the Chernobyl nuclear disaster in Moscow, Russia, Monday, April 26, 2021, on the 35th anniversary of the explosion at the Chernobyl nuclear plant. About 600,000 people, often referred to as Chernobyl's "liquidators," were sent in to fight the fire at the nuclear plant after an explosion on April 26, 1986. (AP Photo/Pavel Golovkin)

Russian veteran fire fighters lay flowers at the Mitino Memorial to commemorate those who died after the Chernobyl nuclear disaster in Moscow, Russia, Monday, April 26, 2021, on the 35th anniversary of the explosion at the Chernobyl nuclear plant. About 600,000 people, often referred to as Chernobyl's "liquidators," were sent in to fight the fire at the nuclear plant after an explosion on April 26, 1986. (AP Photo/Pavel Golovkin)

A man reacts at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

People light candles on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant on early April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

People light candles on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant on early April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

People light candles on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant on early April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

People gather on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

An orthodox priest lights candles on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

People stand next to lit candles on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant on early April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

Orthodox priests hold a commemoration service on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

People light candles on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant on early April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

An abandoned building is seen in the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, during an event to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

An exhibition of photographs by Denys Kopylov is seen at an abandoned building on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, during an event to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION

People stand next to lit candles on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant on early April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

An abandoned building is seen in the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, during an event to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

Women wearing black clothing and face masks with radioactivity sign march under umbrellas in Minsk, on April 26, 2021, to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the tragedy. (Photo by STRINGER / AFP)

Women wearing black clothing and face masks with radioactivity sign march under umbrellas in Minsk, on April 26, 2021, to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the tragedy. (Photo by - / AFP)

A woman wearing black clothing and face masks with radioactivity sign marches under an umbrella in Minsk, on April 26, 2021, to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the tragedy. (Photo by - / AFP)

People, wearing protective face masks amid the Covid-19 pandemic, stand at Chernobyl's memorial in Kiev to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

People, wearing protective face masks amid the Covid-19 pandemic, stand at Chernobyl's memorial in Kiev to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

A man, wearing a protective face mask amid the Covid-19 pandemic, walk at Chernobyl's memorial in Kiev to commemorate the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

A liquidator of Chernobyl nuclear power plant reacts at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

A liquidator of Chernobyl nuclear power plant reacts at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

A liquidator of Chernobyl nuclear power plant kneels to pay his respects at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

A liquidator of Chernobyl nuclear power plant smiles as he talks with former colleagues at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

A liquidator of Chernobyl nuclear power plant kneels to pay his respects at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

Liquidators of Chernobyl nuclear power plant and the Orthodox priests attend to pay to pay his respects at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

People wearing traditional Ukrainian clothes carry flowers to pay to pay his respects at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

People gather to pay their respects at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

A liquidator of Chernobyl nuclear power plant straightens his face mask at Chernobyl's memorial in Kiev during the commemoration of the victims of the Chernobyl nuclear disaster on the 35th anniversary of the world's worst nuclear accident, on April 26, 2021. (Photo by Sergei SUPINSKY / AFP)

This handout picture taken and released by the Ukrainian Presidential Press Service on April 26, 2021 shows the President Volodymyr Zelensky laying flowers at the foot of monument commemorating the victims of the Chernobyl Nuclear Power Plant disaster, near Chernobyl. - Zelensky on April 26, 2021, urged the international community to work together to ensure nuclear security and prevent a repeat of the Chernobyl disaster on the 35th anniversary of the world's worst nuclear accident. (Photo by Handout / UKRAINIAN PRESIDENTIAL PRESS SERVICE / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /Ukrainian Presidential Press Service " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

This handout picture taken and released by the Ukrainian Presidential Press Service on April 26, 2021 shows the President Volodymyr Zelensky laying flowers at the foot of monument commemorating the victims of the Chernobyl Nuclear Power Plant disaster, near Chernobyl. - Zelensky on April 26, 2021, urged the international community to work together to ensure nuclear security and prevent a repeat of the Chernobyl disaster on the 35th anniversary of the world's worst nuclear accident. (Photo by STR / UKRAINIAN PRESIDENTIAL PRESS SERVICE / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /Ukrainian Presidential Press Service " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

This handout picture taken and released by the Ukrainian Presidential Press Service on April 26, 2021 shows the President Volodymyr Zelensky laying flowers at the foot of monument commemorating the victims of the Chernobyl Nuclear Power Plant disaster, near Chernobyl. - Zelensky on April 26, 2021, urged the international community to work together to ensure nuclear security and prevent a repeat of the Chernobyl disaster on the 35th anniversary of the world's worst nuclear accident. (Photo by STR / UKRAINIAN PRESIDENTIAL PRESS SERVICE / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /Ukrainian Presidential Press Service " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky lays flowers on a monument as he attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (L) attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky makes a press statement as he attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky makes a press statement as he attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (C) makes a press statement as he attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (R) attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky and Ukrainian officials lay flowers on a monument during the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky lays flowers on a monument as he attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky lays flowers on a monument as he attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (C) attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (2nd R) attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (C) attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (L) attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky lays flowers on a monument as he attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky (2nd R) attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

210426 -- MINSK, April 26, 2021 -- People lay flowers to commemorate the victims of the Chernobyl disaster in Minsk, Belarus, April 26, 2021. Belarus on Monday marked the 35th anniversary of the Chernobyl disaster. The Chernobyl nuclear power plant, some 110 km north of the Ukrainian capital Kiev, witnessed one of the worst nuclear accidents in human history on April 26, 1986, when a series of explosions ripped through the No.4 reactor, spreading radiation across Ukraine, Belarus, Russia and other European countries. Photo by /Xinhua BELARUS-MINSK-CHERNOBYL DISASTER-35TH ANNIVERSARY HenadzxZhinkov PUBLICATIONxNOTxINxCHN

210426 -- MINSK, April 26, 2021 -- Soldiers lay flowers to commemorate the victims of the Chernobyl disaster in Minsk, Belarus, April 26, 2021. Belarus on Monday marked the 35th anniversary of the Chernobyl disaster. The Chernobyl nuclear power plant, some 110 km north of the Ukrainian capital Kiev, witnessed one of the worst nuclear accidents in human history on April 26, 1986, when a series of explosions ripped through the No.4 reactor, spreading radiation across Ukraine, Belarus, Russia and other European countries. Photo by /Xinhua BELARUS-MINSK-CHERNOBYL DISASTER-35TH ANNIVERSARY HenadzxZhinkov PUBLICATIONxNOTxINxCHN

210426 -- MINSK, April 26, 2021 -- Soldiers lay flowers to commemorate the victims of the Chernobyl disaster in Minsk, Belarus, April 26, 2021. Belarus on Monday marked the 35th anniversary of the Chernobyl disaster. The Chernobyl nuclear power plant, some 110 km north of the Ukrainian capital Kiev, witnessed one of the worst nuclear accidents in human history on April 26, 1986, when a series of explosions ripped through the No.4 reactor, spreading radiation across Ukraine, Belarus, Russia and other European countries. Photo by /Xinhua BELARUS-MINSK-CHERNOBYL DISASTER-35TH ANNIVERSARY HenadzxZhinkov PUBLICATIONxNOTxINxCHN

210426 -- MINSK, April 26, 2021 -- Soldiers lay flowers to commemorate the victims of the Chernobyl disaster in Minsk, Belarus, April 26, 2021. Belarus on Monday marked the 35th anniversary of the Chernobyl disaster. The Chernobyl nuclear power plant, some 110 km north of the Ukrainian capital Kiev, witnessed one of the worst nuclear accidents in human history on April 26, 1986, when a series of explosions ripped through the No.4 reactor, spreading radiation across Ukraine, Belarus, Russia and other European countries. Photo by /Xinhua BELARUS-MINSK-CHERNOBYL DISASTER-35TH ANNIVERSARY HenadzxZhinkov PUBLICATIONxNOTxINxCHN

210426 -- MINSK, April 26, 2021 -- Soldiers lay flowers to commemorate the victims of the Chernobyl disaster in Minsk, Belarus, April 26, 2021. Belarus on Monday marked the 35th anniversary of the Chernobyl disaster. The Chernobyl nuclear power plant, some 110 km north of the Ukrainian capital Kiev, witnessed one of the worst nuclear accidents in human history on April 26, 1986, when a series of explosions ripped through the No.4 reactor, spreading radiation across Ukraine, Belarus, Russia and other European countries. Photo by /Xinhua BELARUS-MINSK-CHERNOBYL DISASTER-35TH ANNIVERSARY HenadzxZhinkov PUBLICATIONxNOTxINxCHN

KIEV, UKRAINE - APRIL 26: (----EDITORIAL USE ONLY ??" MANDATORY CREDIT - "UKRAINIAN PRESIDENCY / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Ukrainian President Volodymyr Zelensky attends the event to commemorate the 35th anniversary of the Chernobyl nuclear disaster in Kiev, Ukraine on April 26, 2021. Ukrainian Presidency / Handout / Anadolu Agency/ABACAPRESS.COM

TOPSHOT - A Chernobyl plant employee lights candles and lays flowers at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - A Chernobyl plant employee holds candle near radioactivity sign at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

TOPSHOT - Chernobyl plant employees carry candles near radioactivity sign at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

A Chernobyl plant employee lights candles and lays flowers at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

Chernobyl plant employee lights candles and lays flowers at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

Chernobyl plant employee lights candles and lays flowers at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

Chernobyl plant employee lights candles and lays flowers at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

Chernobyl plant employee lights candles and lays flowers at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

A woman lights candles at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

A kneeling woman reacts at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

A kneeling woman reacts at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

People hold candles at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

People hold candles at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

A Chernobyl plant employee holds candle near radioactivity sign at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

Chernobyl plant employees carry candles near radioactivity sign at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

A man lights a candle at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

A woman and her daughter light a candle at the monument to Chernobyl victims in Slavutych, the city where the power station's personnel lived, some 50 kilometres (30 miles) from the accident site on April 25, 2021, during a memorial ceremony amid the COVID-19 pandemic, caused by the novel coronavirus. - Ukraine on April 26, 2021 marks the 35th anniversary of the Chernobyl disaster which was the world's worst nuclear accident. (Photo by Sergei SUPINSKY / AFP)

People gather on the central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

A visitor takes a photo of an abandoned building in the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, during an event to commemorate the 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP)

People stand in front of an exhibition of photographs of Denys Kopylov on central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, during an event to commemorate 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION

People stand in front of an exhibition of photographs of Denys Kopylov on central square of the ghost town of Pripyat near the Chernobyl Nuclear Power Plant early on April 26, 2021, during an event to commemorate 35th anniversary of the Chernobyl nuclear disaster. (Photo by Genya SAVILOV / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION

Visitors walk past deserted buildings in the ghost town of Pripyat on April 24, 2021. - The 35th anniversary of the world's worst nuclear disaster will be commemorated in the ex-Soviet country on April 26, 2021. (Photo by Genya SAVILOV / AFP)

A group stands on the central square during a visit to the ghost town of Pripyat on April 24, 2021. - The 35th anniversary of the world's worst nuclear disaster will be commemorated in the ex-Soviet country on April 26, 2021. (Photo by Genya SAVILOV / AFP)

A group listens to explanations as they visit the ghost town of Pripyat on April 24, 2021. - The 35th anniversary of the world's worst nuclear disaster will be commemorated in the ex-Soviet country on April 26, 2021. (Photo by Genya SAVILOV / AFP)

People stand on the central square during a visit to the ghost town of Pripyat on April 24, 2021. - The 35th anniversary of the world's worst nuclear disaster will be commemorated in the ex-Soviet country on April 26, 2021. (Photo by Genya SAVILOV / AFP)

A group stands on the central square during a visit to the ghost town of Pripyat on April 24, 2021. - The 35th anniversary of the world's worst nuclear disaster will be commemorated in the ex-Soviet country on April 26, 2021. (Photo by Genya SAVILOV / AFP)

Peopke walk past a dog sleepling on the central square during a visit to the ghost town of Pripyat on April 24, 2021. - The 35th anniversary of the world's worst nuclear disaster will be commemorated in the ex-Soviet country on April 26, 2021. (Photo by Genya SAVILOV / AFP)