Iran's leadership warned of a regional conflict on Sunday if the U.S. were to attack it, and designated EU armies as "terrorist groups" in a retaliatory move.

As diplomats prepare for negotiations behind closed doors, one Iranian lawmaker just went in the opposite direction—calling for pre-emptive military strikes on Israel and U.S. bases across the Middle East.

Iran's supreme leader warned Sunday that any attack by the United States would spark a "regional war" in the Middle East, further escalating tensions as U.S. President Donald Trump has threatened to militarily strike the Islamic Republic over its crackdown on recent nationwide protests.

Ayatollah Ali Khamenei's comments are the most direct threat he's made so far amid escalating tensions with the U.S.

Iran’s so-called axis of resistance, its regional network of armed proxies and allied militant groups, could come to the fray to provide additional firepower to Tehran in the event of a conflict with the United States,

Amid intensifying U.S.–Iran tensions, attention is turning to how far China will go to protect Tehran from American pressure. Beijing has become Iran’s key economic and political lifeline as sanctions and U.

Iran’s supreme leader has warned that any U.S. attack would trigger a “regional war” in the Mideast. This comes as U.S.

Trump said that if Iran does not make a deal regarding its nuclear program, "we'll find out” whether Iran’s supreme leader was correct to predict that a U.S. attack on the country would spark a regional war.

Iran and the US to hold talks in Istanbul this week to ease tensions, with Pakistan, Saudi Arabia and others invited.