Short of actual military action from the West, which is extremely unlikely as that would give grounds to retaliation by Russia, escalating the war outside Ukrainian borders, Russia seems only days away from removing the Ukrainian government...
The rational thing to do right now is to start planning for the aftermath: how to get Russia out of Ukraine as soon as possible once they've taken control of the country. IMO there's only one way: to dialogue with Putin and finally accept some kind of terms for their removal from Ukraine. This is not what anyone wanted, but now that we've let Putin get to Kiev, what exactly are the options?
Anyone who thinks sending money and weapons to Ukraine will help solve the problem (including, to my horror, the UK government) seems to completely ignore the reality of the situation and is hoping for a delusional outcome, and worse, opening the possibility for things to go wrong and foreign soldiers being killed while trying to reach Ukrainian troops - which may without a doubt trigger a counter-attack by NATO and total escalation of the conflict (which should be priority number one to avoid right now!).