The US evacuated American aircraft from an air base in the UK on Monday following a threat from Iran, according to people familiar with the matter, raising fresh concerns over the security of US military assets amid the ongoing conflict, Wall Street Journal reported.The precise nature of the threat to RAF Mildenhall, including whether it was imminent or more general, remains under discussion among US officials, the sources told WSJ.The development comes as US President Donald Trump signalled that military operations in the Iran war were “effectively over”, while stopping short of ruling out further action against Tehran.“Taking military action doesn’t seem to be a very necessary thing, but we’re locked and loaded, ready to go for any reason that changes,” Trump said.Meanwhile, Iran has stepped up its rhetoric against Washington, calling on the US to “surrender” to Tehran’s terms to end the conflict.In a statement to Iranian media, Rezaei urged Washington to accept Iran’s seven conditions for an immediate end to the war in West Asia.“The war against Iran has torn the US government apart, but Washington is flailing like a desperate gambler -Stop playing. Stop making up news about imaginary negotiations. Do not deny the new order in West Asia -It is time to surrender to Iran’s seven conditions,” Rezaei said.