They were probably expecting Trump to man up at some point, given that the US are the only nation that could force the issue. They still hold the cards, as Trump would put it, and if the US pulls the plug on support for Ukraine, what can NATO do without the possibility of starting WW3? Putin only understands brute force and he knows that we (Europeans) are shit scared of escalation. That is why we can’t let this happen. He will only come back for more and he knows that he has Trump on his pocket.