I don't mean that the US instigated the war or that Ukraine is somehow a puppet, but it is convenient for the US to not have to fight it and let Ukraine use US'

I don't mean that the US instigated the war or that Ukraine is somehow a puppet, but it is convenient for the US to not have to fight it and let Ukraine use US's weaponry, drones etc to fight this war. I am not Russian or a sympathizer, but also not blind to US incentives to sell weaponry in Europe, and hurt an adversary in Russia. It is true that everybody underestimated Ukraine.