Iran's top security official Ali Larijani declared Tehran will not negotiate with the United States, hardening the country's stance after U.S.-Israeli strikes killed Supreme Leader Ayatollah Ali Khamenei. Larijani, secretary of Iran's Supreme National Security Council, dismissed reports of backdoor diplomacy through intermediaries following weekend attacks that killed Khamenei.

His comments mark a sharp reversal from earlier positions where Iranian officials had signaled openness to nuclear talks with Washington if diplomacy were prioritized. Larijani accused U.S. President Donald Trump of plunging the region into chaos and spreading "false hopes" about diplomacy. The escalation follows coordinated U.S.-Israeli attacks that Iran called a "dangerous red line."

Fighting intensified across the region as Israel launched fresh strikes on Tehran Sunday, while Iran and allied groups fired missile barrages at Israeli and U.S.-linked targets. Trump warned overnight that military operations could last several weeks, demanding Iran's leadership surrender or face further strikes. Larijani's rejection of negotiations comes as regional tensions reach their highest point in years.