To keep the Iran nuclear accord alive, some remaining parties to the deal are trying to maintain trade relations with Tehran. The European Union (EU) has been reportedly establishing a new mechanism to facilitate payments for Iranian oil exports, which will not be operational until early next year.

Meanwhile, it has been noticed that the EU did not get a waiver for continuing oil imports from Iran.

"The refusal of EU waivers is punitive," former U.S. State Department official Wayne White told Xinhua, adding that Washington wanted to force the European parties "to rupture sufficient ties with Iran to render the remaining benefits of the agreement of little value to Iran."

Meanwhile, the expert was not optimistic about the possibility that Iran would negotiate another deal with the United States.

"Iran will be very reluctant to return to negotiations because Tehran believes it already signed an agreement, but the U.S. broke it," noted White, who once served as deputy director of the Middle East Intelligence Office of the State Department.

"The whole situation is likely to make nuclear non-proliferation much more difficult in the future," Brookings Institution Senior Fellow Darrell West told Xinhua.

(Xinhua reporter Matthew Rusling in Washington also contributed to the story.)

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