A planned visit by a U.S. delegation to Seoul for high-stakes security talks has been delayed as Washington grapples with escalating tensions in the Middle East, a setback that could slow negotiations over Korea's push to acquire nuclear-powered submarines and secure broader rights to nuclear fuel. According to the Ministry of Foreign Affairs Tuesday, the U.S. side has yet to provide specific dates for the trip, which had been expected in late February or early March. The delay comes as U.S. officials focus on the fallout from Saturday's joint U.S.-Israel strike on Iran, which included the killing of Iranian Supreme Leader Ayatollah Ali Khamenei. Tehran immediately vowed retaliation, raising the prospect of a broader regional conflict. U.S. President Donald Trump has said he is not ruling out further military action, including the possible deployment of American troops, according to U.S. media reports. The postponement has complicated matters for officials in Seoul, where security negotiations have become a priority following agreements reached at an October summit between President Lee