As Russian President Vladimir Putin prepares for his heavily choreographed May 9 “Victory Day” military parade, he’s been clear who’s at the top of his guest list: Xi Jinping.

Russia marks on Friday the 80th anniversary of the Soviet and allied victory over Nazi Germany, though there are fears that Ukraine may seek to disrupt the most hallowed celebration in the Russian calendar.

The attacks came a day before a Russian-proposed cease-fire was to take effect and as Moscow prepared to welcome foreign dignitaries for a parade.