WASHINGTON (AP) — President Donald Trump announced Tuesday the U.S. will pull out of the landmark nuclear accord with Iran, declaring he’s making the world safer but dealing a profound blow to allies and deepening the president’s isolation on the world stage. “The United States does not make empty threats,” he said in a televised address from the White House Diplomatic Room. Trump said the 2015 agreement, which included Germany, France and Britain, was a “horrible one-sided deal that should never ever have been made.” He added that the United States “will be instituting the highest level of economic sanction.” Trump’s decision means Iran’s government must now decide whether to follow the U.S. and withdraw or try to salvage what’s left of the deal. Iran has offered conflicting statements about what it may do — and the answer may depend on exactly how Trump exits the agreement. One official briefed on the decision said Trump would move to reimpose all sanctions on Iran that had been lifted under the 2015 deal, not just the ones facing an immediate deadline. As administration officials briefed congressional leaders about Trump’s plans Tuesday, they emphasized that just as with a major Asia trade deal and the Paris climate pact that Trump has abandoned, he remains open to renegotiating a better deal, one person briefed on the talks said. Hours before the announcement, European countries met to underline their support for the agreement. Senior officials from Britain, France and Germany met in Brussels with Iran’s Deputy Foreign Minister for Political Affairs, Abbas Araghchi. Under the most likely scenario, Trump would allow sanctions on Iran’s central bank — intended to target oil exports — to kick back in, rather than waiving them once again on Saturday, the next deadline for renewal, said individuals briefed on Trump’s deliberations. Then the administration would give those who are doing business with Iran a six-month period to wind down For the Europeans, Trump’s withdrawal constitutes dispiriting proof that trying to appease him is futile. Although the U.S. and Europeans made progress on ballistic missiles and inspections, there were disagreements over extending the life of the deal and how to trigger additional penalties if Iran were found violating the new restrictions, U.S. officials and European diplomats have said. The Europeans agreed to yet more concessions in the final days of negotiating ahead of Trump’s decision, the officials added.