What if we bought some land in Crimea after the war is over?

[TiltsAreUnderrated]

I don't think Ukraine would want to offer this. One of the factors in the invasion in 2014 was Russia's connection to the Sevastopol Naval Base, on which their lease was set to expire in 2017.

In 2010, after Yanukovych had returned to power, he'd extended this to 2042/2047, but its future was uncertain without Yanukovych, and (in any case) Russia would have needed to keep offering gas subsidies for it.

The base itself played a key role in the seizure of Crimea and the destruction of the Ukrainian navy.

[TiltsAreUnderrated]

I agree to an extent. Forcibly breaking up Germany wasn't feasible after either World War

It happened all the same. Even if you disregard East and West Germany, the lands lost elsewhere which weren't previously annexed by the Nazis were quite significant. Some of the areas which were annexed by the Nazis would likely have voted for annexation at the time (Austria), and they were broken off, too.