The downing of the drone - which Washington insists was over worldwide waters but Tehran says was within its airspace - has seen tensions between the two countries spike further after a series of attacks on tankers the United States and its staunch ally, Saudi Arabia, as well as reportedly Israel, have blamed on Iran.
On Friday, Trump revealed that the US forces were ready to strike targets in Iran in response to the downing of the US Navy drone, but stressed that he called off the attacks at the last minute because they were not proportionate.
"While Iran's frustration with Trump's reckless pressure campaign is understandable, we strongly urge Iran to remain in compliance with the nuclear deal", said Mr Daryl Kimball, executive director of the Arms Control Association, a Washington non-profit organisation.
The president said he called off the air strikes after being told 150 Iranians would be killed.
Thursday night's confused and profoundly risky events surrounding the Trump administration's ordering and then cancelling U.S. air strikes against Iran have exposed how close the world is to a catastrophic new war that could ultimately threaten the entire planet. They re going to be so happy, and I m going to be their best friend.
A multinational accord reached by Tehran and world powers in 2015 sought to curb Iran's nuclear ambitions in exchange for sanctions relief.
The reinstatement of U.S. sanctions a year ago - particularly those imposed on the energy, shipping and financial sectors - caused foreign investment to dry up and hit oil exports. Treasury Secretary Steven Mnuchin said Friday that Iran's financial sector would be penalized soon if it doesn't work to stop evading worldwide guidelines created to combat money laundering.
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At the time, analysts said the demise of Toys "R" Us in the USA would prove to be a big blow to the toy industry. Surprise! toys are signing on as the owners of Toys "R" Us gear up to open new stores in time for the holidays .
Iran says it will confront any USA threat as tension spikes
A senior Arab diplomat said the sharply increased tensions would further harm the crisis-hit Middle East region. President Donald Trump through Oman overnight, warning that a U.S. attack on Iran was imminent.
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She notes that the Donna Karan coatdress she wore that day still hangs on the back of her closet door, unworn and unlaundered. One - whom she describes as "a journalist, magazine writer, correspondent on the TV morning shows, author of many books, etc".
"However, we told the Omani official that any attack against Iran will have regional and worldwide consequences".
"Regardless of any decision they (US officials) make, we will not allow the Islamic Republic's territory to be violated", Mousavi said.
Iran has denied any involvement in those incidents.
"You can't have nuclear weapons", Trump said, implying anything else was open to discussion - and if Tehran doesn't want to talk, "you can live in a shattered economy for a long time to come".
"If Iran's leadership comes to the conclusion that it has no choice other than talking to Washington, it will do so only after it has resuscitated its leverage", said Mr Ali Vaez, a director at the International Crisis Group.
Tehran claimed the unmanned United States aircraft entered Iranian airspace early on Thursday morning. Pentagon officials who spoke to Newsweek said forces involved in the mission were woken up at 2 a.m. local time and as late as 3:30 a.m. (7 p.m. EDT) believed the strike would still be carried out. Iran is now facing strong economic pressure after the United States withdrew from the Iran Nuclear Deal in 2018 and reimposed stringent sanctions against the Islamic country.
He said the downing of the US drone was "probably intentional" - contradicting what he said Thursday.
Iran's state news agency IRIB News and IRNA, the Islamic Republic News Agency, have released video and images that claim to show debris of the drone, an RQ-4 Global Hawk. We'll call it 'Let's make Iran great again.' Does that make sense?