Nawaf Salam, the head of the International Court of Justice: “Israel must immediately hold its military offensive of any other action in the Rafah governorate which may inflict on the Palestinian group in Gaza, conditions of life that could bring about its physical destruction in whole or in part.”
In the early Obama era, the lib argument for how this is "supposed" to work is that the UN would identify nation-state level crimes about to happen (or in-progress), and then send a coalition national militaries over there to solve the problem. They based this on such positive examples as UN and NATO interventions in Yugoslavia and Afghanistan.
Don’t forget Korea!