A pilot lays flowers to a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

Relatives lay flowers to a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

A man lights a candle at a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

A woman lays flowers to a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

People lay flowers to a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

People lay flowers to a memorial in Kyiv, Ukraine, Friday, Jan. 8, 202, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

A pilot lays flowers at a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

Relatives react at a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

People lay flowers to a memorial in Kyiv, Ukraine, Friday, Jan. 8, 2021, for the victims of a Ukrainian 737-800 plane crash on the outskirts of Tehran. One year after Iranian forces shot down a Ukrainian jetliner, killing all 176 people on board, more questions remain than answers as families of victims allege harassment by Iranian authorities and affected countries raise concerns about the lack of transparency and accountability in Iran's investigation. (AP Photo/Efrem Lukatsky)

Relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, attend a commemoration ceremony in Kiev on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, attend a commemoration ceremony in Kiev on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, attend a commemoration ceremony in Kiev on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, attend a commemoration ceremony in Kiev on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, attend a commemoration ceremony in Kiev on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Women lay flowers during a commemorative ceremony with relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Women lay flowers during a commemorative ceremony with relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

A man lays flowers during a commemorative ceremony with relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Women lay flowers during a commemorative ceremony with relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

A man reflects during a commemorative ceremony with relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

A man lays flowers during a commemorative ceremony with relatives, friends and colleagues of the crew and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Relatives react in front of a huge screen bearing portraits late crew members and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, during a commemorative ceremony on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Relatives touch a huge screen bearing portraits of late crew members and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, during a commemorative ceremony on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

Relatives react in front of a huge screen bearing portraits late crew members and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, during a commemorative ceremony on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

A woman cries in front of a huge screen bearing portraits of late crew members and passengers of Ukraine International Airlines Flight 752, which crashed in Iran a year before, during a commemorative ceremony on January 8, 2021 at the site of a future memorial on the Dnipro river bank in Ukraine's capital Kiev. - Ukraine International Airlines Flight 752 crashed shortly after taking off from the Iranian capital's main airport on January 8, 2020, killing all 176 people on board. The Islamic republic admitted days later that its forces accidentally shot down the plane after firing two missiles amid heightened US-Iran tensions. (Photo by Genya SAVILOV / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole BURSTON / AFP)

A woman looks on as people gather in memoriam for victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

People hold signs with images of the victims of the downed Ukraine International Airlines flight PS752, which was shot down near Tehran by Iran's Revolutionary Guard, as family and friends gather to take part in a march to mark the first anniversary, in Toronto, Ontario, Canada, on January 8, 2021. - Canada and other nations whose citizens died in Iran's downing of a Ukranian jetliner one year ago on Friday called on Tehran to come clean about the tragedy and "deliver justice" for the victims' families. (Photo by Cole Burston / AFP)

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM

KIEV, UKRAINE - JANUARY 08: Relatives and friends attend a ceremony in honor of the victims of Ukraine International Airlines Flight 752, in a park that will become a square in memory of the victims in Kiev, Ukraine, on January 8, 2021. Flight 752 of Ukraine International Airlines crashed shortly after taking off from Iran's main airport on January 8, 2020, killing all 176 people on board. Vladimir Shtanko / Anadolu Agency/ABACAPRESS.COM