That’s exactly what the U.S. is doing:
US Considers Naval Build-up as Warning to Iran.
The Bush administration is weighing options for a naval build-up in the Gulf as a show of force and a warning to Iran on its nuclear programme and its support for Shia militias in Iraq, it emerged yesterday.
Outgoing UN secretary general Kofi Annan said yesterday that military intervention in Iran would be “unwise and disastrous”, as the Security Council debated a resolution that would impose sanctions on Tehran over its nuclear programme. “I believe that the council, which is discussing the issue, will proceed cautiously and try and do whatever it can to get a negotiated settlement,” he said.
The latest draft resolution would order all countries to ban the supply of specified materials and technology that could contribute to Iran’s nuclear programmes.
Dee's 'Dotes~Anecdotes of a Green Activist 