Perseverance of global rule of law. If Ukraine goes, we go back to 19th century. Any two-bit dictator wannabe will want to invade their neighbor for some sweet sweet territory.

Global economy relies on this stability, and US benefits the most from the stability of the global economy.

We also didn't "spend 75 billion dollars". Very little actual cash went to Ukraine from the US. We gave them old stockpiles, which we were going to decommission anyway, and paid maintenance for. We also paid US companies to increase production (of ammunition for example), and given that the Russia conflict is increasing demands for ammunition, increasing supply is not a bad thing.

This is such a lazy talking point permeating conservative spheres. And it quite likely coming straight from Russia psy-ops.