Please explain how are you going to go forward with diplomacy if the invader here is not to be trusted in even deals and negotiations like this?

Like this. Two sides claim the whole territory. One of them is a neocolonial power (🇺🇲) who bombed 20% of the local population in what was essentially a genocidal campaign that that country (🇰🇵) still hasn't recovered from. The two sides still hate each other's guts. But they established a DMZ where they felt comfortable in maintaining their own zone of influence.

(Also, NK is pretty analogous here in that, like Ukraine, they violated a border agreement when the conflict started, and spent a significant amount of time afterward on the defensive while waiting for Americans and their air superiority to run out of resources).

Additionally, Russia has been pretty forward that it desires a Ukranian DMZ that increases the distance between the missile emplacements of both Russia and NATO. This sort of guarantee would get them to take an armistice seriously.

@yogthos@lemmy.ml