Speaking of the Marshall Plan, it had considerable push back at the time. It took a Soviet backed coup in Czechoslovakia in 1948 for Americans to realize that leaving Europe starved and in tatters would push Europe into the arms of the Soviets. The Marshall Plan was a relatively cheap way to win battles before they ever occurred.
Russia will not, of course, be the same as post-WW2 Nazi Germany. The victors must be Russians, not outsiders. But Westerners should be willing to give freely, maybe with some basic stipulations around rule of law so Russia doesn’t fall back into being a dictatorial kleptocracy that threatens its neighbors.