The goal for the US with the Russia Ukraine war is to make Europe more dependent on them. This is mostly due to the private sector in Germany, who where the onces that decided to buy gass from Russia while the German government shut down all of their nuclear plants...
Now that Russia has invaded Ukraine, the only way to actually weaken the Russian imperialistic mindset is for Ukraine to win. If not they will continue to invade the neighbouring contries such as Estonia, Moldova and Georgia.
And for the last part, here is a qoute from Golda Meir:
"Peace will come when the Arabs will love their children more than they hate us."