Joining Riyadh and its Sunni Arab allies in taking diplomatic action, Kuwait said it was downgrading ties with Iran over a weekend attack on the Saudi embassy in Tehran.
Kuwait’s move came after the UN Security Council strongly condemned the attack, carried out by protesters angry over Saudi Arabia’s execution of a prominent Shia cleric.
Tensions between Saudi Arabia, the main Sunni power, and Shia-dominated Iran have erupted this week into a full-blown diplomatic crisis, sparking widespread worries of regional instability.
Washington and other Western powers have called for calm amid fears the dispute could raise sectarian tensions across the Middle East and derail efforts to resolve conflicts from Syria to Yemen.
The Security Council joined those calls late on Monday, issuing a statement urging all sides to “take steps to reduce tensions in the region”.
The statement by the 15-member council condemned “in the strongest terms” the attacks which saw protesters firebomb the Saudi embassy in Tehran and its consulate in Iran’s second-biggest city Masshad.
But the council made no mention of the event that set off the crisis — Saudi Arabia’s execution on Saturday of Sheikh Nimr al-Nimr, a cleric and activist whose death sparked widespread protests among Shias.
Saudi Arabia cut off diplomatic ties with Tehran in protest at the attacks on Sunday and has severed air links with Iran.
Some of its allies among Sunni Arab states followed suit, with Bahrain and Sudan breaking off ties and the United Arab Emirates downgrading relations on Monday.