Iran tells nuclear inspectors it will enrich uranium up to 20% at underground facility

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told international nuclear inspectors it plans to enrich uranium up to 20% at its underground Fordo nuclear facility, a technical step away from weapons-grade levels, as it increases pressure on the West over its tattered atomic deal.

Iran’s state-run IRNA news agency acknowledged the step after news of a letter it sent to the International Atomic Energy Agency leaked overnight Friday. Russia’s representative to the IAEA similarly acknowledged Iran’s letter on Twitter, though the agency did not immediately respond to a request for comment early Saturday.

The move comes amid heightened tensions between Iran and the U.S. in the waning days of the administration of President Donald Trump, who unilaterally withdrew America from Tehran’s nuclear deal in 2018. That set in motion an escalating series of incidents capped by a U.S. drone strike killing a top Iranian general in Baghdad a year ago, an anniversary coming Sunday that has American officials now worried about possible retaliation by Iran.

The decision comes after parliament passed a bill, later approved by a constitutional watchdog, aimed at hiking enrichment to pressure Europe into providing sanctions relief. It also serves as pressure ahead of the inauguration of President-elect Joe Biden, who has said he’s willing to reenter the nuclear deal.

Mikhail Ulyanov, Russia’s permanent representative to the Vienna-based IAEA, wrote on Twitter that Tehran planned to resume enrichment up to 20% after a Wall Street Journal journalist broke the news.

IRNA later reported Ulyanov’s comments, linking the decision to the parliament bill aimed at restarting higher enrichment at Iran’s underground Fordo facility.

Since the deal’s collapse, Iran has resumed enrichment at Fordo, near the holy Shiite city of Qom, some 90 kilometres (55 miles) southwest of Tehran.

ran’s announcement coincides with the anniversary of the U.S. drone striking Revolutionary Guard Gen. Qassem Soleimani in Baghdad last year. That attack later saw Iran retaliate by launching a ballistic missile strike injuring dozens of U.S. troops in Iraq. Tehran also accidentally shot down a Ukrainian passenger jet that night, killing all 176 people on board.

As the anniversary approached, the U.S. has sent B-52 bombers flying over the region and sent a nuclear-powered submarine into the Persian Gulf.

On Thursday, sailors discovered a limpet mine on a tanker in the Persian Gulf off Iraq near the Iranian border as it prepared to transfer fuel to another tanker owned by a company traded on the New York Stock Exchange. No one has claimed responsibility for the mining, though it comes after a series of similar attacks in 2019 that the U.S. Navy blamed on Iran. Tehran denied being involved.