Two governments can disagree sharply and still need to discuss a missing citizen, a shipping route, or a dangerous military misunderstanding. Diplomacy maintains relationships through which that communication remains possible.
An envoy does more than carry a message. They learn how the other side interprets events, explain what their own side can accept, and explore agreements that leaders may not be ready to discuss publicly. Representation, negotiation, and reporting are recognized functions of a diplomatic mission.
A conversation is useful only if participants understand the authority behind it. A representative may be able to explore possibilities without being empowered to make a binding commitment. Confusing those roles can turn an exploratory discussion into an apparent betrayal.
Diplomatic relationships can help clarify intentions, but they do not erase conflicts of interest or unequal power. A weaker party may accept a proposal because its alternatives are worse; a carefully worded agreement may conceal disagreement that later reappears during implementation.
The work therefore includes maintaining channels after disappointment, distinguishing public positions from negotiable details, and finding ways to make commitments credible. The existence of a conversation is not evidence of agreement. It is infrastructure that can make agreement—or at least a less destructive disagreement—possible.