Ok, lets say it doesnt exist. But you have a land. about 3,000 sq km of it, it has a 5km wide corridor to armenia, protected by rusisan troops. Azeriri Army is 5 km away, they have no idea who gets in or out. and what gets in or out. Azeri army cant enter this land, nor can Azeriri police, nor can Azeri citizens.
Or if Azeri citizens come in, and lets say that citizen dies, with a bullet to his head, who can do anything? can Azeri police arrest the person that put that bullet in his head? can they find out who did it? lets say that armenia send a truck full of ice cream to khankendi, but instead of ice cream its s400. and it arrives in khankendi, and gets deployed, and Azrbaijan, says, hey you've got a new s400, and the "republic of artshak" (which supposedly does not exist) says, oh no, this is just ice cream shaped like a s400. what can happen? will AZE troops kill russians to enter and investigate? This is a problem that nobody is talking about.