diplomacy

noun

1. The art and practice of conducting international relations by negotiating alliances, treaties, agreements etc., bilaterally or multilaterally, between states and sometimes international organizations, or even between polities with varying status, such as those of monarchs and their princely vassals.“National diplomacy typically deploys its dexterity to secure advantage for one's nation.”
2. Tact and subtle skill in dealing with people so as to avoid or settle hostility.