The Saudi king's absence from a regional summit to be hosted by President Barack Obama shows how Gulf states, displeased by what they see as U.S. indifference to Iranian meddling in the Arab world, may hesitate to bless any nuclear deal with Tehran.
An Iranian cargo ship will set sail for the rebel-held Yemeni port of Hodeida on Sunday evening, Iran's Tasnim news agency said, in a move likely to fan further tensions with Saudi-led forces blockading the country.
A Moroccan F-16 warplane that is part of the Saudi-led force carrying out air strikes in Yemen has gone missing, Morocco's military said on Monday, and Iran-allied Houthi rebels and Saudi forces traded heavy fire across the border.
Iranian-allied Houthi fighters in Yemen accepted on Sunday a five-day humanitarian ceasefire proposed by adversary Saudi Arabia but warned they would respond to any violations.
