It's cyrillic, sad that larger version don't exists.

Eagle Bold  Suggested by ellouder2OMG 

It seems to be Eagle Bold, well, I'm not sure if it's that source (do not edit message by frd because I do not have any more ideas to suggest a source)

No, rounds not so equable to each other by width or height with Eagle. Caros looks very similar but "У" and "к" slightly different.

Bump