Iranian clerics holding up anti Saudi King Abdullah bin Abdul Aziz placards face riot policemen during a protest in front of the Saudi embassy in Tehran on March 17, 2011 in support of the Shiite protesters in Bahrain and against the violent crackdown by the ruling Sunni Muslim dynasty in the capital Manama. Armed forces from fellow Gulf Cooperation Council (GCC) states Saudi Arabia and the United Arab Emirates entered Bahrain on March 14 to help the government there deal with the protesters -- a move slammed by Shiite Iran, which already has tense relations with some of its Arab neighbours on the Gulf.  AFP PHOTO/ATTA KENARE (Photo credit should read ATTA KENARE/AFP via Getty Images)