Russia has warned of an imminent catastrophe as tensions between Israel and Iran spiral, following an ultimatum from Iran's Supreme Leader Ayatollah Khamenei. Khamenei declared Iran will "never surrender" and threatened the U.S. with "irreparable damage" if it attacks Tehran. The statement came as President Trump hinted at potential strikes and Israel intensified its offensive with U.S. backing. Khamenei urged Iranians to stay resilient amid growing panic in Tehran.