Iran has halted oil shipments to Britain and France, the Oil Ministry said Sunday, in an apparent pre-emptive blow against the European Union after the bloc imposed sanctions on Iran's crucial fuel exports.

The EU imposed tough sanctions against Iran last month, which included a freeze of the country's central bank assets and an oil embargo set to begin in July. Iran's Oil Minister Rostam Qassemi had warned earlier this month that Tehran could cut off oil exports to "hostile" European nations. The 27-nation EU accounts for about 18 percent of Iran's oil exports.

The EU sanctions, along with other punitive measures imposed by the United States, are part of Western efforts to derail Iran's disputed nuclear program, which the West fears is aimed at developing atomic weapons. Iran denies that, insisting its program is for peaceful purposes.

The spokesman for Iran's Oil Ministry, Ali Reza Nikzad-Rahbar, said on the ministry's website Sunday that "crude oil exports to British and French companies have been halted."

"We have our own customers and have no problem to sell and export our crude oil to new customers," he said.

Britain's Foreign Office declined to comment, and there was no immediate response from French officials.

The semiofficial Mehr news agency said exports were suspended to the two countries Sunday. It also said the National Iranian Oil Company has sent letters to some European refineries with an ultimatum to either sign long-term contracts of two to five years or be cut off.Mehr did not specify which countries were sent the ultimatum, but Spain, Italy and Greece are among Europe's biggest buyers of Iranian oil.

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