Today the US has two strategic enemies - Russia and China - and two strategic partners, Nato in Europe and everyone in pacific except China.
The US can spend peanuts - it really isn't a lot of money in US defence terms - backing Ukraine and using Ukrainian casualties to defeat it's strategic enemy, Russia, whilst making it's other strategic enemy, China, fear it.
Or it can waver and show it's no longer the leader of the democratic world and make all it's allies in Europe and Asia not believe in it.
My big fear is that it is empowering China to dare to have it's go at Taiwan in a couple of years.