People with Russian national flags attend the opposition rally in support of jailed opposition leader Alexei Navalny in Moscow, Russia, Wednesday, April 21, 2021. Police across Russia have detained large numbers of people in connection with demonstrations in support of imprisoned opposition leader Alexei Navalny, according to a human rights group. (AP Photo/Denis Kaminev)

Young people applaud attending the opposition rally in support of jailed opposition leader Alexei Navalny in Moscow, Russia, Wednesday, April 21, 2021. Police across Russia have detained large numbers of people in connection with demonstrations in support of imprisoned opposition leader Alexei Navalny, according to a human rights group. (AP Photo/Alexander Zemlianichenko)

People clash with police during a protest in support of jailed opposition leader Alexei Navalny in St. Petersburg, Russia, Wednesday, April 21, 2021. A human rights group that monitors political repressions said at least 400 people were arrested across the country in connection with the protests. Many were seized before protests even began, including two top Navalny associates in Moscow. (AP Photo/Dmitri Lovetsky)

People gather to attend the opposition rally in support of jailed opposition leader Alexei Navalny in the historical center of Moscow toward Red Square, Russia, Wednesday, April 21, 2021. Police across Russia have detained large numbers of people in connection with demonstrations in support of imprisoned opposition leader Alexei Navalny, according to a human rights group. (AP Photo/Denis Kaminev)

A supporter waves the Russian national flag and shouts slogans during the opposition rally in support of jailed opposition leader Alexei Navalny in the center of Moscow near Red Square, Russia, Wednesday, April 21, 2021. Police across Russia have detained large numbers of people in connection with demonstrations in support of imprisoned opposition leader Alexei Navalny, according to a human rights group. (AP Photo/Alexander Zemlianichenko)