"We are asking them to go to zero", a State Department official said on a call with reporters, adding that countries that buy Iranian oil should be winding down purchases now rather than waiting until November.
"Iran will remain committed to the deal, as long as its interests are preserved", Rouhani said.
"It is incorrect and unwise to imagine that some day all producer countries will be able to export their surplus oil and Iran will not be able to export its oil", he said.
A day earlier, Rouhani had issued similar comments, saying Iran could disrupt regional exports if it stopped from exporting oil after US President Donald Trump in May pulled outfrom a nuclear deal signed with world powers and the European Union. Tehran said its foreign minister would meet counterparts from US allies Britain, France and Germany, as well as Russian Federation and China, in Vienna on Friday to discuss ways of maintaining the nuclear deal.
"If they want to stop Iranian oil exports, we will not allow any oil shipment to pass through the Strait of Hormuz", Ismail Kowsari was quoted as saying by the Young Journalists Club (YJC) website.
According to the sources, External Affairs Minister Sushma Swaraj had not given any assurance to her Iranian counterpart Mohammad Javad Zarif about oil import from Iran when they held talks here in May. However, Japan has so far refused to cut Iranian oil imports.
The UAE, an American-allied federation of seven sheikhdoms on the Arabian Peninsula, hosts some 5,000 US troops.
The administration's tough new stance on Iranian exports, which goes far beyond what the Obama administration demanded and what most market experts were expecting, suggests that Russian Federation and Saudi Arabia have agreed to make up whatever Iranian production is taken out of the market, Vakhshouri said.
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He noted the first part of US sanctions will take effect in early August.
Switzerland - where significant parts of the pact known as the Joint Comprehensive Plan of Action were negotiated - will work to ensure that future USA sanctions do not target any humanitarian goods, Bern said in a statement.
The Iranian leader added that Iran will outlast the current American administration.
Japanese officials said last week, after US diplomats pressed the country to cut back its purchases, that they were still deliberating.
The EU's foreign service, the EEAS, was not immediately available for comment on the meeting.
The nuclear deal reached between Iran, Germany and the five permanent members of the United Nations Security Council - China, France, Russia, the United Kingdom and the United States - was once seen as a consequential accord that would reshape Middle East politics. But European officials acknowledge that US sanctions make it hard to give Tehran guarantees.
Washington insists the world has enough spare oil capacity to replace Iranian crude, and Trump has said that he has persuaded Saudi Arabia to balance the market by boosting its own production.