Ummm, perhaps you forgot to do your fact checking here? Considering Ilya is only 43, and Mumiy Trol was formed in 1983, 4 decades is a bit impossible. And it's definitely not the first time he's sang in English, the song 'Polar Bear (Me Eskimo)' is in English and there's an English version of Paradise Ahead was performed at SXSW.
Umm, a decade is ten years is it not? 80s is one decade, 90s, is another. 00's are a third, and this one we're in now, would be the fourth. So yeah, they are in their fourth decade making music.
This is the band's first full-length where EVERY song is sung in English.
So no, my facts are right.
The band was indeed formed in 1983. Ilya was 15 when he formed the band, was he not?