US warns Iran of 'swift, decisive' response in case of provocative behaviour

The US has warned Iran of a "swift and decisive" response in case of any attacks by Tehran or its proxies of any identity against American interests or citizens.

Secretary of State Mike Pompeo's statement came a day after US President Donald Trump imposed tougher-than-ever sanctions on Iran's iron, steel, aluminum and copper sectors, a move aimed at stopping Tehran from acquiring a nuclear weapon and intercontinental ballistic missiles and to counter its "malign influence" in the Middle East.

Pompeo, in a strongly-worded statement said: "The regime in Tehran should understand that any attacks by them or their proxies of any identity against US interests or citizens will be answered with a swift and decisive US response".

"Our restraint to this point should not be mistaken by Iran for a lack of resolve. To date the regime's default option has been violence, and we appeal to those in Tehran who see a path to a prosperous future through de-escalation to modify the regime's behaviour," he said.

Pompeo referred to the statement of Trump on Wednesday in which he said that he "looks forward to someday meeting with leaders of Iran in order to work out an agreement and, very importantly, taking steps to give Iran the future it deserves".

Iran, Pompeo alleged, has engaged in an escalating series of threatening actions and statements in recent weeks.

The response of the United States and its partners and allies has been clear: "We do not seek war".

"But Iran's 40 years of killing American soldiers, attacking American facilities and taking American hostages is a constant reminder that we must defend ourselves," Pompeo said.

Acting Defence Secretary Patrick Shanahan described it as a "very well-coordinated and crafted" statement.

Democratic Senator Chris Murphy criticised Pompeo for his statement on Iran.

"This statement is a big trouble. Who decides what an Iranian proxy is? Does that include the Houthis? Every single Iraqi Shia militia? Assad?