Is it ensure, insure, or assure?
Exemption of diplomats — ambassadors and other representatives of a foreign nation — from the laws of the nation to which they are assigned.
Note: Foreign representatives have sometimes gone unpunished for serious crimes after claiming diplomatic immunity. The main purpose of diplomatic immunity, however, is to protect diplomats from harassment or arrest by their host government.
in international law, the immunities enjoyed by foreign states or international organizations and their official representatives from the jurisdiction of the country in which they are present.