See the Guardian factcheck on actual amounts spent. Europe gave more than the US. That 'beautiful ocean' is no barrier to ICBMs.
I get that he's trying to massively cut spending to justify tax cuts, but this will massively change the balance of power in the world. The fall-out (not the nuclear kind) will hit a lot of Americans, including the MAGAs, but obviously not his rich friends.
The tax cuts proposed already benefit the 1% - the promise for no taxes on tips and overtime is notably absent from his proposed laws.