The US said it struck Iranian military sites at the weekend and Iran’s Revolutionary Guards said on Monday it had targeted a US ​base in response, the latest exchange of attacks amid negotiations to end the three-month-old war.The US and Iran have sporadically exchanged strikes since their ceasefire took effect in early April as diplomacy aimed at a more durable agreement drags on. A similar exchange occurred last Thursday and was described in near-identical terms by both sides.The weekend US strikes on Iran’s Gulf coast were in response ​to “aggressive Iranian actions that included the shootdown of a U.S. MQ-1 drone that was operating over international waters,” the US Central Command said in a post on X.“U.S. fighter aircraft swiftly responded ⁠by eliminating Iranian air defences, a ground control station, and two one-way attack drones that posed clear threats to ships transiting regional waters,” Centcom said, ‌adding ‌it ​would continue to protect US assets and interests during the ongoing ceasefire.Iran’s Islamic Revolutionary Guard Corps said on Monday it had targeted an airbase used by the US in response to the attack on southern Iran, without ⁠identifying which base.Air defences in Kuwait, where a major US ​base is located, were intercepting missile and drone attacks on Monday as ​sirens sounded across the country, the state news agency KUNA reported, without providing further details.The war launched by the US and Israel on February 28th has killed thousands ‌of people, mainly in Iran and Lebanon, and caused global ​economic pain by pushing up energy prices due to Iran’s effective closure of the Strait of Hormuz.In a late-night ⁠social media post, US president Donald Trump did not mention the ⁠exchange of hostilities, repeating his as-yet unproven ​claim that Iran “really wants to make a deal”.He berated critics, including what he described as “seemingly unpatriotic Republicans”, for negative “chirping” about negotiations to end the conflict.“Just sit back and relax, it will all work out well in the end – It always does!” he said.Trump is under pressure to reopen the Strait of Hormuz and get US gasoline prices down in advance of the November congressional elections, as voters show increasing frustration over rising prices. At the same time, he faces a potential backlash from Iran hawks in his own party over any concessions to Tehran.Oil prices rose about 2 per cent in Asia on Monday as the lack of progress in negotiations kept traders on edge.Trump has said his key ‌aim in the war is ⁠to prevent Iran from developing a nuclear weapon with its highly enriched uranium. Tehran has consistently denied having plans to do that.The two sides remain at odds on several other issues, such as Tehran’s demands for the lifting of sanctions and the release of ‌tens of billions of dollars of Iranian oil revenues frozen in foreign banks.Israel’s war in Lebanon with the Iranian-backed Hizbullah militia is another major impediment.Israeli prime minister Binyamin Netanyahu said ​on Sunday he had ordered troops to move farther into Lebanon in the battle against Hizbullah.US secretary of state Marco Rubio spoke with both Lebanese president Joseph Aoun and Netanyahu on the diplomatic negotiations between Israel and Lebanon and has proposed a plan to allow for “gradual de-escalation,” a US official said. – Reuters