Photo taken on June 12, 2018 shows people perform on the celebration of Russia Day in Vladivostok, Russia. Russia Day, on June 12, marks the date when the First Congress of People's Deputies of the Russian Federation adopted the Declaration of Russia's National Sovereignty in 1990. (Xinhua/Wu Gang)

Photo taken on June 12, 2018 shows people perform on the celebration of Russia Day in Vladivostok, Russia. Russia Day, on June 12, marks the date when the First Congress of People's Deputies of the Russian Federation adopted the Declaration of Russia's National Sovereignty in 1990. (Xinhua/Wu Gang)

Photo taken on June 12, 2018 shows people perform on the celebration of Russia Day in Vladivostok, Russia. Russia Day, on June 12, marks the date when the First Congress of People's Deputies of the Russian Federation adopted the Declaration of Russia's National Sovereignty in 1990. (Xinhua/Wu Gang)

Photo taken on June 12, 2018 shows people perform on the celebration of Russia Day in Vladivostok, Russia. Russia Day, on June 12, marks the date when the First Congress of People's Deputies of the Russian Federation adopted the Declaration of Russia's National Sovereignty in 1990. (Xinhua/Wu Gang)