New Delhi, Dec. 27 -- Saudi Arabia on Thursday called on Emirati-backed separatists in southern Yemen to withdraw from two governorates they now control, a move that has threatened to spark a confrontation within a fragile coalition that has been battling the Iran-backed Houthi rebels in the country's north.

The statement from Saudi Arabia's Foreign Ministry appeared aimed at putting public pressure on the Southern Transitional Council, a separatist Yemeni force long supported by the United Arab Emirates. Saudi Arabia backs the National Shield Forces of Yemen's internationally backed government in the war against the Houthis.

The separatists' actions have "resulted in an unjustified escalation that harmed the interests of all segments o...