Isn't Russia Eastern Orthodox?
Orthodox Easter will fall on Sunday, April 24, 2022, according to the Julian calendar used by Eastern Orthodoxy.
https://www.christianity.com/wiki/holidays/orthodox-easter-origin-and-date.html
What Is Orthodox Easter? Origin and Date for 2022
The different date for Orthodox Easter comes from following the Julian calendar that differs from the Gregorian calendar which is used by most western countries and Christian denominations.
https://www.christianity.com/wiki/holidays/orthodox-easter-origin-and-date.html
In response mars 1776 to his Publication
Yes