Politics: 3 Hotspots in the world and the US does not have enough military hardware and ammo.

There are 3 major hotspots in the world ..... Ukraine,. Taiwan and North Korea. The Narrative is that America and NATO does not even have enough ammunition and military hardware to support Ukraine against Russia.
So what is America doing in Taiwan and North Korea? Do you Know?
Please... someone tell me, because I also want to know ...