Iran has been provoking us since 1978. They believe that if they acquire nuclear weapons it will make them invulnerable to us (the North Korea option). Geographically speaking, they're pretty hard to get at with conventional forces, especially since we've exited Iraq and are in the midst of exiting Afghanistan. However, they're exporting missiles and personnel to Venezuela on a weekly basis, so I expect they plan to poke at us some more in the future. At some point, they will **** us off enough to inspire a serious response and I think it may come as an unpleasant surprise to them and the Venezuelans when the time comes.
By doing what?