We had people at the train stations to pick up Ukrainian refugees. I do not remember anything like that happening during the Syrian refugee crisis.
As far as supporting a "corrupt regime" You're going to be hard pressed to find a nation that's entirely unproblematic. I'm not going to hinge my support for a countries sovereignty on any of that. The Ukrainian government has been democratically elected, there's no doubt about that, and it's not guilty of anything that would warrant foreign intervention. If it did, whatever intervention was necessary would have to go through the UN, and not be decided by a dying oligarch, but we're in agreement about that.