The war is inevitable. America doesn’t decide if Russia invades Ukraine or not. It can only decide if it will help Ukraine or not.

If america helps Ukraine, they will severely cripple Russia, thus making later invasions unlikely.

I america doesn’t help Ukraine, Russia will just get what they want and move on to invade more countries, leading to more wars.

You can’t just give a flower to the invader, say “peace” and suddenly there are no more wars.