These things should be dealt by LAW and JUSTICE and you should not link one to another because if you do then you end up justifying the USSR crimes because Nazi Germany did this!
UPD: A crime should be a crime in all countries. The problem is that some countries use other's crimes as an argument. I said "things should NOT all be dealt with equally" because the judgement should base not on what others think about this but what the moral and the law says.