Are the sanctions mostly about turning Russia into a true democracy?
And the invasion of Ukraine just brought up this opportunity?
They have someone "playing madman with nukes", Nixon tried that, but relented because it isn't a position to succeed on. Realistically, rock and the hard place is either end the war or end their 'democracy' and have a different set of jerks take over.
It is a way to stop financing the war and make people pay attention into inside problems.