A warship is seen on Main Naval Parade to mark Russian Navy Day in St. Petersburg, Russia on July 29, 2018. The Navy Day is a national holiday in Russia that normally takes place on the last Sunday of July. (Xinhua/Wu Zhuang)

Russian Navy personnel attend the Main Naval Parade to mark Russian Navy Day in St. Petersburg, Russia on July 29, 2018. The Navy Day is a national holiday in Russia that normally takes place on the last Sunday of July. (Xinhua/Wu Zhuang)

Russian Navy personnel wait ahead of Main Naval Parade to mark Russian Navy Day in St. Petersburg, Russia on July 29, 2018. The Navy Day is a national holiday in Russia that normally takes place on the last Sunday of July. (Xinhua/Wu Zhuang)

Russian President Vladimir Putin (R) attends the Main Naval Parade to mark Russian Navy Day in St. Petersburg, Russia on July 29, 2018. The Navy Day is a national holiday in Russia that normally takes place on the last Sunday of July. (Xinhua/Wu Zhuang)

Russian Navy personnel shout slogans during the Main Naval Parade to mark Russian Navy Day in St. Petersburg, Russia on July 29, 2018. The Navy Day is a national holiday in Russia that normally takes place on the last Sunday of July. (Xinhua/Wu Zhuang)

An elder Navy veteran passes the Navy personnel after the Main Naval Parade to mark Russian Navy Day in St. Petersburg, Russia on July 29, 2018. The Navy Day is a national holiday in Russia that normally takes place on the last Sunday of July. (Xinhua/Wu Zhuang)