There is no similarity between the two nations. Russia was serious - he will not accept NATO troops on his border as that proposal is what started this war. By suggesting the UN, Putin shows he’s fine with administration of Ukraine. Zelensky is no longer president as his term expired last year, and his country is so sick of him, he wouldn’t win a legitimate election. So to ensure stability, UN administration is better than nothing at all, and it helps fill the demand for ‘protection’.
Zelensky has run the Ukraine into the ground and will soon be out of a job, he’s not being serious, but even as his men die in pointless battle, he’s being sarcastic.
Of course he was. That was my point to the guy who was taking him seriously as part of an EU plot to conquer Russia.