I've seen plenty of interviews in the boy's native language which is Russian. It was a while before this story was picked up and some journalists traveled to Russia to question "Boris" and translated the info into English. Unfortunately there are not many English language videos about this prodigy young man but here is a pretty good one.
Russian Boy Claiming He’s From Mars Issues Apocalyptic Warning That Makes Experts Uneasy
https://youtu.be/kAKgdWlXmu8