Switzerland takes care of the US interests in Iran in absence of diplomatic ties.
The United States, which has its Fifth Fleet based in tiny Arab Persian Gulf monarchy, has declined to call the Saudi troops' deployment in Bahrain as incursion and has voiced support for the Riyadh's military intervention in the internal affairs of Bahrain.
The Islamic Republic also summoned Bahrain's charge d'affaires in Tehran over the recent developments.
Saudi Arabia has sent more than 1,000 Saudi soldiers into Bahrain amidst widespread antigovernment protests.
The move is part of a wider Persian Gulf Cooperation Council (PGCC) effort to shore up the Bahrain government which has been facing unrest for the past few weeks.
Saudi military forces in tanks and armored personnel carriers crossed the 16-mile causeway into the tiny island kingdom of Bahrain.
Persian Gulf Cooperation Council states, by contrast, moved quickly in response to a request from Bahrain's ruling al-Khalifa family to dispatch the first deployment of Arab troops across national borders since a revolt in Tunisia in December sparked unrest across the Arab world.
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