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.
Well you're in Austria aren't you? Ukraine is a continental neighbour. Syria isn't.

As far as supporting a "corrupt regime" You're going to be hard pressed to find a nation that's entirely unproblematic.
Well now you're talking my language. We're corrupt (NATO, UK, "the West", whatever). That's why we support corrupt regimes.

I'm not going to hinge my support for a countries sovereignty on any of that.
I'm not keen on sending billions of dollars to such regimes.

The Ukrainian government has been democratically elected, there's no doubt about that
Do you have a short memory? They had a democratic government overthrown, and we helped.

...and it's not guilty of anything that would warrant foreign intervention.
I'd agree here. They are guilty of war crimes, but that's what happens when people invade you. That's not a deal breaker. I don't like it obviously, but I don't like war.