"Phase two might be positive and might be very negative. Maybe a total termination. That is a very real possibility," US President Donald Trump said.
Trump's statement comes several days after he announced the US administration's decision not to certify Iran's compliance with the deal, also known as the Joint Comprehensive Plan of Action (JCPOA).
Commenting on Washington's move, Moscow said that Russia remains committed to the deal, is interested in preserving it and calls on all other participants of the agreement to do the same. Meanwhile, German Foreign Minister Sigmar Gabriel said on October 13 that Berlin would try to persuade the US Congress to keep the deal.
US Secretary of State Rex Tillerson said on Sunday that Washington wanted to fully enforce the Iran nuclear deal as it is and "then begin the process of addressing the flaws," emphasizing that the agreement is in the best interest of the United States.