And the extra sales mean at least a partial subsidy for increasing the size of the US military industrial base.
We also gain training in a far more realistic environment and valuable feedback about the performance of our weapons in actual use.
The Europeans could seek to make a deal with China to protect them from Russia. Allowing all of Eurasia to fall into one, huge, anti-American power would be the height of folly. But for that reason, I wouldn't put past the ability of our stupid political class.
Before the invasion President Trump had our American troops in Ukraine training them, while also arming them.
This invasion really kicked the cobwebs out of our ancient weapon stocks and barely functioning weapon production and has really helped our preparedness, along with the rest of NATO, and even our Pacific allies, Putin really opened up a mass of Western military budgeting and revamping, and even incredible geographical military gains.