It's not an assumption it's a fact. Although, they have resumed the aid atm.
That bold part is the only thing that matters. This proxy war is not supposed to end any time soon.
As for Trump, some domestic policies and the approaches may be different but the major attitude toward the rest of the world and those policies will not. If he wasn't working with the regime or deep state or whatever it is called, they wouldn't allow him to continue breathing. The first elimination attempt during his campaign gave him the message which he understood very well.
Why did US allow Russia to do what it does? First, there was war against Georgia, then Against Crimea (Ukraine) and then again, against the whole Ukraine.
Not sure about Ukraine but regarding Georgia the US could not do anything. Neither militarily nor legally because AFAIK after USSR got dissolved the smaller states that declared independence signed some sort of agreement (I've forgotten the name) with Russia that allows Russians to do these things!