I agree NATO is playing a very bold game here
Its members are sending lethal weapons, fighter jets, ammunition, and volunteers into the conflict zone, on top of all the sanctions and travel restrictions and everything else. Of course it's all legal (collective self-defence) but it's incredibly provocative.
Perhaps they feel emboldened by how hapless the Russian invasion has been so far. They may be thinking Russia can't do anything serious to them with conventional forces and wouldn't dare go nuclear. US/NATO intelligence was pretty accurate in the leadup to invasion, perhaps they are seeing things we're not.
And it might be the right call. Appeasing Putin all these years hasn't worked either.