Iran's Supreme Leader Ali Khamenei issues warning to U.S. in Russian on social media, signaling Tehran's growing alignment with Moscow amid nationwide protests.

Iran's supreme leader Ali Khamenei, a pillar of its theocratic system since the inception of the Islamic revolution, has seen off a succession of crises throughout his rule with a mixture of repression and strategic manoeuvring but now could be facing his biggest challenge.

A woman in Canada has become a global symbol of defiance against Iran's regime. A viral video shows her lighting a cigarette from a burning photo of Ayatollah Ali Khamenei.