A nuclear power has attacked a sovereign state and told us to stay away or something very bad will happen.
They've been sabre rattling for weeks and weeks and we have frozen unable (or unwilling) to act. No good deed goes unpunished, every sanction has a cost etc etc but we're not ready to pay even a smallest price in order to save lives protect world peace. Or to save "western values" our leaders are wording at each opportunity.
If we really wanted to stop the invasion we'd send half a million soldiers to "hang around" in Ukraine weeks ago. Or at least we'd send them thousands of anti helicopter and antitank missiles. We cannot prevent Russia's bombing and destruction of Ukraine but the missiles would easily stop an invasion.
Russia is a country with extremely concentrated wealth and therefore power - the oligarchs are one of the few leverage points we have. If we temporarily froze (right now confisction would be more appropriate) assets owned by oligarchs in the west, deplatform them from payment systems, credit cards, universities, golden visas. Capture their yahts, jets they'd take care of Putin rather quickly. We know who they are, they're on the Forbes list posing for pictures.
Somehow we in the west eagerly go after the weak (Ottawa protesters) but cannot seam to do the same towards rich (with power and means to corrupt).
The rules based Western world has gone out of the window and we're quickly heading towards a world with two sets of rules (or rather two standards of rule enforcement).