Wall Street Journal:

U.S., European and Iranian officials meet Tuesday in Vienna, a last opportunity for the Obama administration to bolster the Iranian nuclear agreement along with its partners before President-elect Donald Trump takes office.

The officials are meeting under the aegis of the so-called Joint Commission, comprised of representatives of Iran and the six world powers who negotiated the July 2015 nuclear deal. The commission oversees the implementation of the accord and arbitrates disputes among the signatories.

In recent months, the Commission has approved decisions to exempt some Iranian nuclear material from the country’s stockpile limits and sought to shore up the agreement with measures to ensure Iran doesn’t breach the terms of the nuclear accord by exceeding caps on material such as uranium and heavy water.

During the U.S. presidential campaign, Mr. Trump repeatedly attacked the accord, a key foreign-policy legacy of the Obama administration. After the Nov. 8 election, U.S. officials said they were looking for ways to help secure the agreement.

Among the issues set for discussion Tuesday are Iranian complaints about the decision last month by U.S. Congress to extend nonnuclear U.S. sanctions on Tehran, according to diplomats.

The meeting may also address the decision by the six powers to allow Iran to import large amounts of natural uranium. On Monday, Western diplomats confirmed that the U.S. had backed a request by Russia to export more than 100 tons of natural uranium to Iran. A second export request by Kazakhstan is pending, they said...

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