Responsibility to Protect (RtoP)

A measure of international protection in the face of the likelihood of crimes against humanity in a country or region that is based on three pillars: the responsibility of each State to protect its populations (first pillar); the responsibility of the international community to help States protect their populations (second pillar); and the responsibility of the international community to protect a State’s populations when the State is manifestly failing to do so (third pillar).

UN