The best end to the invasion of Ukraine that I could see would be mass-desertion of invading troops. It involves the fewest casualties and has the least risk of nuclear retaliation. And there's already hopeful signs -- abandoned equipment, rumors about inadequate preparation...
(And there's precedent. In fact, last time a Russian army walked away from a battlefield en masse, they toppled the brutal oligarch who sent them there in the process. Could be a bonus. Or a risk.)
Are there any organizations one could support that are working to encourage this? Promising funds to deserters trying to find new homes when this is over? Making sure everyone in the Russian army knows about ways out? Lobbying the EU to welcome these people? Something else?
I don't think I have relevant skills, but I'd like to throw some money and publicity this way.