epa04713514 Yemeni Foreign Minister Riyad Yassin speaks during a press conference at the Yemeni embassy, in Kuwait City, Kuwait, 20 April 2015. Yassin on 20 April dismissed an Iranian offer to mediate in the Yemeni crisis. Saudi Arabia and eight fellow Sunni Arab countries launched an air campaign in late March in Yemen against the Shiite Houthi rebels, widely believed to be backed by Shiite Iran. Saudi Arabia has rejected several calls by Tehran for an end to the Yemen campaign. EPA/RAED QUTENA