it really shouldnt be what if a russian whats to have a symbol of the soviet union? seems like a fine emblem to me. the real question is are you asking because you want to make one or are you asking because you made one and got reported?
I can see why you're asking this. The Swastika was modified (the tailed off ends and the circles disappear) to mean something totally different under the Nazi regime and you could argue that the Hammer & Sickle represents Stalin's grave crimes against humanity.
I don't know. I wouldn't use it in case I get matched against Russian players, just in case. How about replicating the crests of regiments/squadrons? Keeps it all military-like and I'm sure there are some good ones out there.