[nradov]

Even if Ukraine ultimately loses some of their sovereign territory, supplying them with weapons is a cheap way to degrade Russian military capabilities with no risk to US forces or our NATO treaty allies. What we have spent on military aid to Ukraine is a tiny fraction of our overall military budget so for the USA there is really no downside. Regardless of who loses, we still win. Some people may be uncomfortable with putting it in such stark amoral terms but that is the geopolitical reality of how such decisions are made.