It's a war of attrition on all fronts and NATO is certainly in a good position. I'm highly skeptical on the US holding firm after some recent political moves. I think the rest of NATO could handle it from here if needed but the concern I have is China. The US holds much more leverage with China than Europe and if the US loses interest then China is likely extremely motivated to "help" Russia. By help, I mean support Russia to extract whatever they want from them.