For those unaware of the short, ignominious history of the League of Nations and its demise over Ethiopia & Italy, the UN today is at the same point with Iran & Israel.
League of Nations, 1930s. Ethiopia knew Italy was going to invade & asked the League to help. They ignored. Italy invaded. The League folded.
2012-2013: Israel asks the UN to help prevent Iran from nuking Israel. The UN is ignoring (so is the US); absent action from someone – like an Israeli EMP attack on Iran – Iran will nuke Israel… & the UN will dissolve.