The first set of USA sanctions that had been eased under a landmark Iran nuclear accord target financial transactions involving US dollars, Iran's automotive sector, the purchase of commercial airplanes and metals, including gold.
"The United States is fully committed to enforcing all of our sanctions, and we will work closely with nations conducting business with Iran to ensure complete compliance".
A U.S. official said Monday that "nearly 100 worldwide firms have announced their intent to leave the Iranian market".
The EU has taken the unprecedented step in a bid to salvage the nuclear deal struck with Iran in 2015.
It called on the worldwide community "not to allow such significant achievements in multilateral diplomacy to be sacrificed in the name of American aspirations to settle political scores with Iran".
In a statement on Monday just hours before the sanctions went back into effect, Trump said: "The Iranian regime faces a choice".
"Negotiations with sanctions doesn't make sense".
He says the move is needed to prevent Iranian nuclear ambitions.
The sanctions went back into effect under an executive order Trump signed three months after he pulled the US out of the 2015 global accord limiting Iran's nuclear activities. Anyone doing business with Iran will NOT be doing business with the United States. Its currency the rial has lost nearly two-thirds of its value in six months.
She made the announcement on the same day renewed US trade sanctions against the Islamic Republic restarted.
Manafort bank fraud trial, day four
She said Gates told her in a conference call the income level "was too high" and proposed reclassifying a portion of it as a loan. Mueller's team said the witnesses refused to testify or would refuse to answer certain questions if not given the protection.
So long as that trade continues, the U.S. will likely face an uphill battle in convincing smaller nations that they can't follow China's lead.
The German Economy Ministry said Berlin would continue to offer export and investment guarantees for firms doing business with Iran. "I am asking for WORLD PEACE, nothing less!"
Mr. Erdan, who also heads the Strategic Affairs Ministry, praised the USA for reimposing punitive sanctions on Iran that brought back into effect the harsh penalties lifted under the Iran nuclear deal.
The EU foreign affairs chief Federica Mogherini said that the EU would pass a "blocking statute" on Tuesday to nullify U.S. legal action against European companies in connection with Iran.
British Minister of State for the Middle East Alistair Burt said Europe can protect its companies from new U.S. sanctions which were reinstated on Tuesday, as the European Union activated a blocking statute to insulate firms against any fallout.
He said the U.S. has long designated Iran as the world's foremost state sponsor of terrorism.
President Trump said on Monday the United States was "fully committed to enforcing all of our sanctions" and would aim "to ensure complete compliance".
"So for the moment the choice is already made by most of these companies to pull out of Iran, despite the threat of the European Union to sue them for doing so", Euronews' Brussels correspondent Bryan Carter reported for Good Morning Europe.
Rouhani praised Europe for "resisting the Americans" in its call "to join the regime of sanctions".