As a helicopter mechanic, this may not look like a lot, but I can 100% guarantee that the entire helicopter is a write off with that dammage. You would have to rip apart the entire helicopter and put it back together with a bunch of brand new parts for it to be safe again. This at the very least is a total refit requirement. Or some Russian pilots can go die after they did not realize one of those balls embeded itself in the transmission, either works.