Flights at Yemen’s Aden international airport were halted on Thursday, the latest sign of a deepening crisis between Gulf powers Saudi Arabia and the United Arab Emirates, whose rivalry is reshaping war-torn Yemen.

Yemen declared a state of emergency Tuesday and demanded that the UAE forces leave the country within 24 hours, a call backed by Saudi Arabia. Riyadh...

Dispute has potential to create civil war in south of Yemen and spill over into neighbouring countries