An opposition leader Alexei Navalny, centre, signals to onlookers as he is escorted hand-cuffed after a court hearing in Moscow, Russia, Monday, Jan. 18, 2021. A judge has ordered that Alexei Navalny be held in custody for 30 days, his spokeswoman Kira Yarmysh said on Twitter. The ruling Monday concluded an hours-long court hearing set up at a police precinct where the politician has been held since his arrest at a Moscow airport Sunday. (AP Photo/Pavel Golovkin)

An opposition leader Alexei Navalny is escorted hand-cuffed after a court hearing in Moscow, Russia, Monday, Jan. 18, 2021. A judge has ordered to Alexei Navalny in custody for 30 days, his spokeswoman Kira Yarmysh said on Twitter. The ruling Monday concluded an hours-long court hearing set up at a police precinct where the politician has been held since his arrest at a Moscow airport Sunday. (AP Photo/Pavel Golovkin)

Opposition leader Alexei Navalny is escorted out of a police station in Khimki, outside Moscow, following the court ruling that ordered him jailed for 30 days. - Kremlin critic Alexei Navalny on Monday urged Russians to stage mass anti-government protests during a court hearing after his arrest on arrival in Moscow from Germany. (Photo by Alexander NEMENOV / AFP)

Opposition leader Alexei Navalny is escorted out of a police station in Khimki, outside Moscow, following the court ruling that ordered him jailed for 30 days. - Kremlin critic Alexei Navalny on Monday urged Russians to stage mass anti-government protests during a court hearing after his arrest on arrival in Moscow from Germany. (Photo by Alexander NEMENOV / AFP)

Opposition leader Alexei Navalny is escorted out of a police station in Khimki, outside Moscow, following the court ruling that ordered him jailed for 30 days. - Kremlin critic Alexei Navalny on Monday urged Russians to stage mass anti-government protests during a court hearing after his arrest on arrival in Moscow from Germany. (Photo by Alexander NEMENOV / AFP)

Opposition leader Alexei Navalny is escorted out of a police station in Khimki, outside Moscow, following the court ruling that ordered him jailed for 30 days. - Kremlin critic Alexei Navalny on Monday urged Russians to stage mass anti-government protests during a court hearing after his arrest on arrival in Moscow from Germany. (Photo by Alexander NEMENOV / AFP)

Opposition leader Alexei Navalny is escorted out of a police station in Khimki, outside Moscow, following the court ruling that ordered him jailed for 30 days. - Kremlin critic Alexei Navalny on Monday urged Russians to stage mass anti-government protests during a court hearing after his arrest on arrival in Moscow from Germany. (Photo by Alexander NEMENOV / AFP)

Opposition leader Alexei Navalny is escorted out of a police station in Khimki, outside Moscow, following the court ruling that ordered him jailed for 30 days. - Kremlin critic Alexei Navalny on Monday urged Russians to stage mass anti-government protests during a court hearing after his arrest on arrival in Moscow from Germany. (Photo by Alexander NEMENOV / AFP)

Opposition leader Alexei Navalny is escorted out of a police station in Khimki, outside Moscow, following the court ruling that ordered him jailed for 30 days. - Kremlin critic Alexei Navalny on Monday urged Russians to stage mass anti-government protests during a court hearing after his arrest on arrival in Moscow from Germany. (Photo by Alexander NEMENOV / AFP)

MOSCOW, RUSSIA - JANUARY 18: Russian opposition politician Alexey Navalny is escorted out of a police station in Khimki, outside Moscow, Russia on January 18, 2021 following the court ruling that ordered him jailed for 30 days. Navalny was detained ????sfor repeated violations of the probation period????? since Dec. 29, 2020. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 18: Russian opposition politician Alexey Navalny is escorted out of a police station in Khimki, outside Moscow, Russia on January 18, 2021 following the court ruling that ordered him jailed for 30 days. Navalny was detained ????sfor repeated violations of the probation period????? since Dec. 29, 2020. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 18: Russian opposition politician Alexey Navalny is escorted out of a police station in Khimki, outside Moscow, Russia on January 18, 2021 following the court ruling that ordered him jailed for 30 days. Navalny was detained ????sfor repeated violations of the probation period????? since Dec. 29, 2020. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - JANUARY 18: Russian opposition politician Alexey Navalny is escorted out of a police station in Khimki, outside Moscow, Russia on January 18, 2021 following the court ruling that ordered him jailed for 30 days. Navalny was detained ????sfor repeated violations of the probation period????? since Dec. 29, 2020. Sefa Karacan / Anadolu Agency/ABACAPRESS.COM