People gather in a terminal before the expected arrival of Russian opposition leader Alexei Navalny on a flight from the Germany in Vnukovo airport outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Pavel Golovkin)

Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive, outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Dmitry Serebryakov)

Police officers stand guard in a terminal of Moscow's Vnukovo airport before the expected arrival of Russian opposition leader Alexei Navalny, outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Pavel Golovkin)

APTOPIX Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive, outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Dmitry Serebryakov)

Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive, outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Dmitry Serebryakov)

Police detain Navalny's supporters in the arrivals hall prior arriving Alexei Navalny in Vnukovo airport outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Alexander Zemlianichenko)

Police officers stand guard in a terminal of Moscow's Vnukovo airport before the expected arrival of Russian opposition leader Alexei Navalny, outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent.(AP Photo/Dmitry Serebryakov)

Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive, outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Alexander Zemlianichenko)

Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive, outside Moscow, Russia, Sunday, Jan. 17, 2021. Leading Kremlin critic Alexei Navalny flew home to Russia on Sunday after recovering in Germany from his poisoning in August with a nerve agent. (AP Photo/Pavel Golovkin)

Police vehicles are seen parked outside Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

A general view of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

People gather in a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

A police officer searches a woman detained at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Police officers detain a supporter Alexei Navalny at Moscow's Vnukovo airport where the opposition leader is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Police officers detain a supporter Alexei Navalny at Moscow's Vnukovo airport where the opposition leader is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Law enforcement officers stand in front of people gathered in a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

Law enforcement officers are seen in a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Police officers detain a man at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Law enforcement officers stand guard in a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

Law enforcement officers stand guard in a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

Law enforcement officers stand guard in a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

Law enforcement officers stand guard in a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

Law enforcement officers stand guard outside a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Law enforcement officers stand guard outside a terminal of Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by NATALIA KOLESNIKOVA / AFP)

Law enforcement officers stand guard in the arrivals hall at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

Riot police stand guard in the arrivals hall at Moscow's Vnukovo airport where Russian opposition leader Alexei Navalny is expected to arrive on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Alexander NEMENOV / AFP)

An information board shows the status of Pobeda flight DP936 from Berlin to Moscow at Moscow's Vnukovo airport on January 17, 2021. - A flight carrying Kremlin critic Alexei Navalny back to Russia has been diverted away from a Moscow airport where his supporters and media had gathered, AFP journalists on the plane said. (Photo by Alexander NEMENOV / AFP)

MOSCOW, RUSSIA - JANUARY 17: Police officers detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: People gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police take measures as crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police take measures as crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police take measures as crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police take measures as crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police take measures as crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police take measures as crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Dmitri Chirciu / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Crowds gather at Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Security forces take measures at Vnukovo International Airport in Moscow, Russia on January 17, 2021 as crowds gather for the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Some supporters of Navalny were arrested by police. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police officers guard the Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police officers detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police officers detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police officers detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: People gather at the Vnukovo International Airport in Moscow, Russia on January 17, 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police officers guard the Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police officers detain a supporter of Russian opposition leader Alexei Navalny at Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 17: Police officers guard the Vnukovo International Airport in Moscow, Russia, 17 January 2021 before the planned arrival of Russian opposition leader Alexei Navalny for Moscow. Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM