The decrepit old fool sent Ukraine munitions that were meant for our forces. Plus he is trying to turn the military into a woke joke.
We are not in a good position if some foreign aggressor invades us.
He hates this country and wants it destroyed.
No foreign aggressor is going to invade you anytime soon. Certainly not before any current US equipment stockpiles are long obsolete.
Now, its certainly possible that all current and potential US allies can gradually be compromised or absorbed, if not supported. A well armed US could easily end up pitted, alone, against a uniformly hostile world. Fortress America is not a good outcome.