A more thorough explanation:

Definition: Rapprochement (ra-prosh-mahn) refers to the establishment or restoration of friendly relations between two or more nations.

For example, after years of tension and conflict, the rapprochement between the United States and Cuba in 2015 led to the reopening of embassies and the easing of travel restrictions.

This term is important in international relations because it signifies a shift towards cooperation and diplomacy rather than hostility and conflict.