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Fuck him. First, he’ll do what we wants regardless of whether you concede to his demands. If we wants to withdraw troops, he’ll withdraw them, no matter what concessions you make to him in hopes of preventing that. Look at his history. Look at how he has treated the other party in Every. Single. One. of the “deals” that he’s made. He fucks them over. NEVER believe he’ll hold up his side of whatever bargain you make. He won’t.
Don’t ever concede to this bully. The more you concede, the more demands he’ll make, like with a blackmailer. Call his bluff. Say, “Sorry, we don’t agree. If that means you’ll withdraw, then don’t let the screen door hit ya where the good lord split ya on the way out.” Bam! End of bullying and if he didn’t want to withdraw, he’ll find some excuse no to go through with it (or probably just lie and say you agreed to do something for him behind the scenes).
Maybe not, even probably not, but with Europe’s help it can at least keep fighting for now, with the possibility that something could happen in US or Russia to change the equation in that time. That’s all very uncertain, but what is certain is that if Europe agrees to this Putin/Trump terms of surrender, it’s over for Ukraine immediately. And then other countries will be next.