Suzerainty

A suzerain (/ˈsuːzərənti, -rɛnti/, from Old French sus "above" + soverain "supreme, chief") is a person, state or polity who has supremacy and dominant influence over the foreign policy and economic relations of another subordinate party or polity, but allows internal autonomy to that subordinate.^[1][2] Where the subordinate polity is called a vassal, vassal state or tributary state, the dominant party is called the suzerain. The rights and obligations of a vassal are called vassalage, and the rights and obligations of a suzerain are called suzerainty.

Suzerainty differs from sovereignty in that the dominant power does not exercise centralized governance over the vassals, allowing tributary states to be technically self-ruling but enjoy only limited independence. Although the situation has existed in a number of historical empires, it is considered difficult to reconcile with 20th- or 21st-century concepts of international law, in which sovereignty is a binary concept, which either exists or does not. While a sovereign state can agree by treaty to become a protectorate of a stronger power, modern international law does not recognise any way of making this relationship compulsory on the weaker power. Suzerainty is a practical, de facto situation, rather than a legal, de jure one.

Current examples include Bhutan and India. India is responsible for military training, arms supplies, and the air defense of Bhutan.^[3][4][5][6]