Note that this is true for the Catholic church and others who use their calendar. The Eastern Orthodox church has Easter Sunday next week.
Also note that the Eastern Orthodox church is not the church of Russia, there are quite a few Orthodox churches who recognize each other as having the same creed, but who don't otherwise share leadership (with 14 Patriarchs - Constantinople, Alexandria, Antioch, Jerusalem, Georgia, Cyprus, Bulgaria, Serbia, Russia, Greece, Poland, Romania, Albania, and the Czech Republic and Slovakia, and a few others).
Also note that the Eastern Orthodox church is not the church of Russia, there are quite a few Orthodox churches who recognize each other as having the same creed, but who don't otherwise share leadership (with 14 Patriarchs - Constantinople, Alexandria, Antioch, Jerusalem, Georgia, Cyprus, Bulgaria, Serbia, Russia, Greece, Poland, Romania, Albania, and the Czech Republic and Slovakia, and a few others).