The Roosevelt is also tracking a convoy of Iranian ships headed to the Gulf of Aden, said a Defense official speaking on condition of anonymity because they were not authorized to speak publicly about the Iranian vessels
If he wasn't authorized to speak, why did this official open his mouth?
As to the embargo/quarantine/intercept (used to be called MIO during the 90's in the Red Sea) it has the look of Sharp Fence/Maritime Guard/Sharp Guard of 20 years ago.
But politically, this smells of the Spanish Civil War where some nations fed arms to the sides in a civil war, and other nations (League of) set up an arms embargo. In short, this is growing into a tidy little mess. It's good political fun to see that Iran and the US have more or less the same short term goal in getting ISIS put down, but not the same goal (short or long term) in Yemen.
Note: you don't need a carrier to conduct Maritime Intercept Operations (MIO) but it doesn't hurt to have one.
