The demands also include such that if Ukraine accepted them, it might just as well capitulate completely, as they would be completely defenseless against a renewed Russian aggression. So, Russia clearly had no intention of negotiating.

I am confused by this enthusiasm for Han Duck-soo. I can understand being enthusiastic about Hong Junpyo and even Kim Munsu, and even Yoon, even though I don't share in that enthusiasm. But I cannot see any reason to support Han Duck-soo with such vigour.