Right now there are just two things that is stopping the US from carrying out a military operation against Iran. The first of course is Obama doesn't want a new military campaign with less than 12 months before an election but more importantly its oil prices thats got the US worried, what will Iran do to the Straits of Hormuz. Now we have Iran threatening to blockade the Straits of Hormuz if there are economic sanctions and they are threatening the US they are not allowed to send their carriers into the Persian Gulf. The Iranians should not play with fire here and mistake Obama's inaction to America's capability to take action if it choses to. The US has the capability to squash Iran like a bug if it came to war and they would. If the ayatollahs are smart they will start playing nice and stop trying to provoke everybody, especially the US.
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from the article: Iran threatens to take action if U.S. carrier returns to Persian Gulf