I would not be surprised if the US attacks Iran before the UN votes sanctions, because the Bush doctrine is pre-emption in the face of threat and Iran has now threatened the West's oil lifeline
...in case of Iran's sanction [they] must know that under those conditions there would be no oil tanker leaving the Persian Gulf intact

http://tinyurl.com/83w7l
The US Navy and Marines would have to occupy the Iranian islands that guard the strait of Hormuz
Near the north coast are a few Iranian (Persian) islands, which include, Kish, Qeshm, Abu Musa and the Greater and Lesser Tunbs. These islands have great strategic positions functioning as platforms for monitoring the marine traffic.

http://en.wikipedia.org/wiki/Strait_of_Hormuz
Iran didn't threaten us, we threatened them. They have only said they will fire back if we shoot at them first.
I still think we should invade Iran, but there is no need to for us to lie about it.