I have absolutely no expertise on this subject, but I think an effective approach would be to isolate and financially cripple the wealthy people who surround hi

I have absolutely no expertise on this subject, but I think an effective approach would be to isolate and financially cripple the wealthy people who surround him. Make them hurt finally; basically make their "wealth" irrelevant outside of Russia. Lock down all their assets and ban them from entering the country (UK/US/many EU states). If a large group of powerful, very wealthy people suddenly find their luxury life threatened because of the small-man complex of one person, they will turn on that person - directly or more likely secretly. There must be enough people with enough money to collectively carry out a leadership replacement action. Add the "will of the people" who also don't want this war, and it should be easier to remove the source of the problem than to fight head on. To clarify, cutting the entire country off from SWIFT would be a clumsy approach when targeted measures could be taken as I suspect above.