The Russians (and the Chinese) welcome the opportunity to test their weapon systems against Western technology. It is similar to how the world powers used the Spanish Civil War in the run up to WWII.
Certainly, the Pentagon is also testing our weapons systems against the Russians in this proxy war. Virtually all the artillery shells, bombs, and missiles from both sides are landing on Ukrainian soil. The big loser is Ukraine. The proxy war is destroying an already poor country.
Patriot is old.
This system dates from the 1980s.
Its direct equivalent is the Soviet S300.
That's some neat logic. The country that is successfully fighting off an aggressor who has declared its intentions of conquering 90% of the country except maybe part of the west (Russkies put out such maps early in the conflict) is somehow the "big loser".
Nah, the chinese aren’t supporting Russia militarily.
The Russians used all their advanced weaponry early in the conflict and a lot of it failed or was used once. They have lots of old school Soviet stuff that they are now reduced to using.