The leader of Yemen’s presidential council declared a state of emergency and cancelled a security pact with the United Arab Emirates (UAE) on Tuesday after Abu Dhabi-backed separatists seized swathes of territory. “The joint defence agreement with the UAE is hereby cancelled,” a statement said, while a separate decree announced a 90-day state of emergency, including a 72-hour air, sea and land blockade. The announcements by Rashad al-Alimi, head of the Presidential Leadership Council, come after the Saudi-led coalition fighting in divided Yemen said it struck a UAE weapons shipment destined for the separatists. The UAE-backed Southern Transitional Council (SCT) forces have swept through the south of Yemen this month, taking most of resource-rich Hadramawt province and swathes of neighbouring Mahrah. Alimi ordered the SCT to hand over the territory to Saudi-backed forces, calling the separatists’ advance an “unacceptable rebellion” in a televised address. The confrontation risks tearing apart the already fractured Yemeni government, which has different factions backed by oil-rich Gulf powers Saudi Arabia and the UAE. It also threatens slow-moving peace negotiations with the Houthis, who ousted the government from the capital Sanaa in 2014, triggering a military intervention by the Saudi-led coalition.