Fulfilling a campaign promise, US President Donald Trump has announced he is pulling the United States out of the Iran nuclear deal. The landmark accord was established and negotiated in 2015 under then president Barack Obama. The world was quick to respond to the move, especially Iran. CGTN'S White House correspondent Nathan King reports.

It's no surprise that the U.S. is withdrawing from the Iran nuclear, but the U.S. is reimposing all previous sanctions and is warning Iran not to start nuclear activities.

DONALD TRUMP US PRESIDENT "We will be instituting the highest level of Economic Sanctions. Any nation that helps Iran in its quest for nuclear weapons could also be strongly sanctioned by the U.S."

The U.S. actions will make it very difficult for European nations who want to keep the nuclear deal to keep doing business with Iran.

The EU, Russia, and China will be talking to Iran in the coming days. Tehran says it's willing to see if the deal can be salvaged, but won't hesitate to restart uranium enrichment if that doesn't happen.

HASSAN ROUHANI IRANIAN PRESIDENT "I ordered the Iranian Atomic Energy Organisation to be ready for action if needed, so that - if necessary - we can begin our industrial enrichment without any limitations. Until the implementation of this decision, we will wait for some weeks and will hold talks with our friends and allies and other signatories of the nuclear deal, and those who will remain loyal to the deal will talk. Everything depends on our national interests."

Meanwhile, unveiling a new controversial pressure policy on Iran, the U.S. says Tehran "must never acquire" a nuclear weapon. The White House also wants Iran to halt development of ballistic missiles and its support for terrorist groups in the region.

NATHAN KING WHITE HOUSE "For nearly three years all world powers except the U.S. have said the Iran deal is working and that Tehran is fulfilling its obligations. Now, it's in tatters. What will satisfy Washington when it comes to Iran is a question that perhaps diplomacy cannot answer. Nathan King, CGTN White House."