People watch the Navy Day parade in St. Petersburg, Russia, July 28, 2019. (Xinhua/Lu Jinbo)

Russian warships are seen during the county's annual Navy Day parade in Kronstadt in St. Petersburg, Russia, July 28, 2019. (Xinhua/Lin Jian)

Russian submarine Kronstadt is seen during the county's annual Navy Day parade in the Neva River in St. Petersburg, Russia, July 28, 2019. (Xinhua/Lu Jinbo)

A Russian submarine and a warship are seen during the county's annual Navy Day parade in Kronstadt in St. Petersburg, Russia, July 28, 2019. (Xinhua/Lin Jian)

Russian combat aircrafts perform during the annual Navy Day parade in St. Petersburg, Russia, July 28, 2019. (Xinhua/Lu Jinbo)

Russian combat aircrafts perform during the annual Navy Day parade in St. Petersburg, Russia, July 28, 2019. (Xinhua/Lu Jinbo)

Russian warships sail to Kronstadt during the county's annual Navy Day parade in St. Petersburg, Russia, July 28, 2019. (Xinhua/Lin Jian)