The US obviously doesn't care but the aid is helping Ukraine keep it's independence and even if US pulled out Europe would continue it's support. Like Poland is amping up ammo production to the point where it alone can supply Ukraine with ammo. Ex-soviet countries fucking hate Russia for a good reason. Also even if Ukraine got no support it's not like they would stop fighting, they would just be slaughtered and occupied by the Russians which is the worst outcome for them considering what's going on in the occupied regions. Like for once the US military is not doing something completely morally reprehensible and is actually opposing imperialism for once, that's a good thing.