Which powers and duties included dealing with the leaders of other countries?

The powers and duties related to dealing with leaders of other countries typically fall under the authority of the executive branch, particularly the President or Prime Minister. These powers include conducting foreign policy, negotiating treaties, and representing the nation in international affairs. Additionally, leaders often engage in diplomacy, appoint ambassadors, and may have the authority to recognize foreign governments. Overall, these responsibilities are crucial for maintaining international relations and ensuring national security.