The fundamental premise for interpersonal interactions is open and honest communication. Without sufficient mutual trust, even if negotiations and talks can be established, they often amount to mere bluffing, and in the end, either produce limited results or none at all.
This is a universal principle that applies to interactions between individuals or nations, fundamentally adhering to this premise.
Unless the negotiation is initially set as a smokescreen for launching an attack, basic trust and disclosure of permissible information are necessary, no matter how cunning the tactics. Otherwise, negotiations can't proceed at all.