I'm not 100% certain it is russian, but is orthodox and from one of the slavic languages, so probably Russian. If you recognise it or can understand it it would be nice if you post the lyrics below. The link is Христос Воскресе-Васкршњи спот 2011;Hristos Voskrese-Easter orthodox song - YouTube and is slightly different from the normal one below
Христос Воскресе из мертвых,
смертию смерть поправ
и сущим во гробех живот даровав!
If anyone knows any other good modernish music (by modernish not ancient chant type) hymms for easter from the Russian Orthodox Church (or any other christian church) feel free to link them or mention them.