It's time for the United States to hold Iran accountable.

The Trump administration is imposing sanctions on Iran following its recent ballistic missile test.

The US Treasury Department announced the measures against 13 people and a dozen companies on Friday.

President Donald Trump tweeted earlier: "Iran is playing with fire - they don't appreciate how 'kind' President Obama was to them. Not me!"

But Iran has said it will not yield to "useless" American threats from "an inexperienced person".

Some of the newly sanctioned groups are based in the United Arab Emirates, Lebanon and China.

The measures come a day after President Trump said "nothing is off the table" in dealing with Iran.

But Iran's Foreign Minister Mohammad Javad Zarif tweeted on Friday that the Islamic Republic was unmoved by US threats. He said Iran had no intention of using its military against any country, except in self-defence.

"Will never initiate war, but we can only rely on our own means of defence," Mr Zarif wrote.

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