The size of these conflicts are tiny. The US military can fight two MAJOR conflicts simultaneously. By comparison, the Ukraine and the Middle East barely count as one. Many people don’t understand the size of the US military and it’s ability to project power. It would take two massive wars the size of WWII to overextend the US currently. If something like that were to happen, NATO would obviously be stepping in, adding a massive backing to an already massive military.

The only military in the world that could even begin to deplete the USAs ability to respond indefinitely would be China and that is super questionable (Especially in light of the laughable showing from the Russian military, there’s serious question as to what kind of paper tiger China is at this point. There’s no question they are going to be more formidable than the Russian military, but there’s a lot of speculation that it won’t be by much. They have too much corruption and grift, the same as the Russian military, just not quite as extensive). They don’t have the material, supply, and logistic to fight a sustained and protracted battle with the US. The US, being effectively an isolated country, has the largest Navy in the the world and is literally built around a logistics chain that requires absolutely NO land transport. The US can have a full logistical chain anywhere in the world, all feeding back from the US mainland if necessary and sustain that indefinitely.