Well, maybe Putin's plan B at this point is to tell Ukrainians either give up Donbas and Crimea or he will proceed with carpet bombing the whole country. A month ago this wouldn't be an option for Zelensky but being responsible for the lives of millions gives you a different perspective, especially if you can end the war and the suffering of your people instantly with just one difficult decision. Tough spot. Especially when you know you can't believe in any word Putin says.