Until summer things looked pretty good for Russians. Oligarchs will be loosing hope during the winter. They will start to use their money to make sure they get more money.

There are plenty of opportunities in Russia when you have dollars. Some of these opportunities will be detrimental for war or even putin.

As long as the oligarchs have a theoretical possibility to get these assets back, they might try to convince Russia to stop their madness. It is better to keep these assets frozen to give them the incentive to work towards good.