I don't think it's negative to suggest that any deal will not last anyway and I don't really think about it tbh, it's not my problem. I don't really like the idea of Trump marching around the world carving pieces of countries up and claiming victory.
Ukraine could have sat down with Russia and sorted out a shit deal where they give away territory themselves, the only thing trump adds is pressure on them to accept it.
It's like a guy seeing a kid getting bullied. He goes over, puts his hand in the kids pocket and hands 10% of the kids money over to the bully. He then tells the kid how much he just helped him. Noble peace prize for that great hero, and what have you incentivised the bully to do tomorrow?
To answer your question... Russia have played chicken with the west, knowing the USA would buckle in support of Ukraine eventually. I'd carry on as is, we aren't fighting the war for Ukraine, they aren't an unwilling participant as far as my limited knowledge goes. That's the game of chicken for you, someone jumps first.