

Camp David Accords? 13 days of negotiations with the US, Israeli, and Egyptian leaders of the time? I think the Dayton agreement was similar too. Leaders are involved in this stuff, not always but it’s certainly not unusual either.
This is a reason able counter-argument. However, I still think it’s quite rare for leaders of two nations actively at war to come together and discuss a peace plan.
I don’t think this is a good counter argument since this was more allies getting together to discuss and negotiate plans. Zelensky and Putin would be more like the Emperor of Japan meeting with FDR to discuss a peace treaty for Japan. Or Hitler and Churchill getting together.
Leaders usually wait until an agreement is in place before putting their reremovedtions on the line, as there’s always resistance from hardline “fight to the end” factions. It’s smarter to confront that opposition only when the benefits of a deal are assured.