Russia does get to keep them. In fact the next 18-months are going to settle, on the battlefield, the question of Ukrainian existance. It will be a rump state, and Moscow will be the one determining who can run for office in Kiev. The Zelinski govt will go into exile in England and the EU will never recognize their central bank losses, but even worst than seizing Russian Funds... everyone who invested in Ukriane will write off their “assets”. Brits 1.1T; France 800B, US Blackrock 378B and the other 10 EFTS down for 1.6T.
Get your BTC and forget about Ukraine.
Russia has been trying to do that for over three years and has failed. Russia does not have the strength to force the issue. Ukraine may not have the ability to regain the territories militarily, but Russia does not have the ability to break Ukraine.