The main challenge is to be able to propose, negotiate, mediate or otherwise participate in talks and agreements that contribute to reinforce the relations between nations maintaining at all times...
Game theory can be used to explain the behavior of states in the international system, especially under realist philosophies. By assuming that all actors in the system are rational and that the...
Read "Diplomacy" by Henry Kissinger. It is an excellent history of diplomacy and the only contentious parts are the personal views offered by a giant of American diplomacy.