You do realize that the vast majority of the dollars from various countries’ Ukrainian war support programs doesn’t actually leave the domestic economy, right? Take the US for example; America says it’ll send 50 billion USD of defense equipment, America sends that amount of equipment from it’s current sites, it then buys new stuff from domestic manufacturers to replace what is now absent.
This is what is happening across Europe, as well. Ukraine gets stuff that’s old, but still good enough to embarrass Russia’s weapons platforms, while the donating country gets to outfit it’s forces in even newer shit.