Domestic Call
Iran is going to have nukes soon. Europe seems to want no part of stopping it. The U. S. Is already stretched. It is going to take a concerted effort to stop the Iranian government without wiping out the Iranian people.
You know what this all reminds me of? An old married couple. The U. S. is the old man who drinks and boasts a bit. He works hard and tries to keep the world together with a roof over it's head. Europe is like the old mother who wines and complains. She has a glass of wine tries to keep the family together by using diplomacy, but can't always convince the kids to play nice.
Thus, they fight. The UN trys to play counselor. Nothing seems to get done until there is a major crisis. Then the immediate family pulls together for a while. Just ask any cop what happens when you roll up on a domestic call and both members of the argument are about to be arrested. They band together against the cops.
When Iran pushes hard enough, they will get smacked by both parents. Then, hopefully, expelled and cut off from the family until they grow up.