President Donald Trump threatened "there won't be anything left" of Iran if no peace deal is reached, as their truce came under further strain with drone attacks on US allies in the Gulf.Washington, locked in a war with Iran since US and Israeli forces launched strikes in late February, has struggled to break an impasse in negotiations and end the conflict, which has shaken the Middle East and sent energy prices climbing."For Iran, the Clock is Ticking, and they better get moving, FAST, or there won't be anything left of them," Trump wrote on his Truth Social platform Sunday. "TIME IS OF THE ESSENCE!"The two sides have been communicating via mediator Pakistan but have failed to reach a lasting agreement amid a shaky temporary truce, which was tested again on Sunday by fresh strikes on Gulf nations. Saudi Arabia reported intercepting three drones entering the country from Iraqi airspace, while the United Arab Emirates said a drone sparked a fire at its Barakah Nuclear Power Plant, one of three UAVs that entered from the "western border direction".UAE presidential adviser Anwar Gargash appeared to refer to Iran and its regional proxy groups when he condemned the attack, which ignited a fire but caused no injuries or impact on radiation levels."The terrorist targeting of the Barakah clean nuclear power plant, whether carried out by the principal perpetrator or through one of its agents, represents a dangerous escalation," he wrote on X.Iranian-backed armed groups equipped with drones are based in Iraq, while Tehran's allies in Yemen -- the Houthi rebels -- also possess combat-grade UAVs.