ISTANBUL — Iran will abandon restrictions on nuclear research and development, including on the advancement of centrifuges used to enrich uranium, as the next step toward reducing its commitments under the 2015 nuclear deal, President Hassan Rouhani said Wednesday.

Rouhani made the announcement in a televised address and said the change would go into motion Friday.

Under the nuclear pact it struck with world powers in 2015, Iran is allowed limited research and development on advanced centrifuges, which accelerate the production of fissile material that can be used to make a nuclear bomb.

On Wednesday, Rouhani said Iran’s Atomic Energy Organization will “immediately start research and development on whatever technical needs the country has and will set aside all the commitments stipulated” under the nuclear deal, according to Iranian state media. 

Amidst high tensions with the U.S., Iran said July 8 it had surpassed the limits on its enriched uranium stockpile. What does that mean for the nuclear deal? (Joyce Lee/The Washington Post)

“We will witness research and development on different kinds of centrifuges . . . and whatever is needed for enriching uranium at a faster pace,” he continued, adding that the activities would be supervised by the International Atomic Energy Agency, the U.N. nuclear watchdog.

Iran’s steps are part of an effort to persuade European nations to reset the terms of the deal after the United States’ withdrawal from it last year. The Trump administration reimposed harsh sanctions on Iran in the fall. 

Iran has said it will reduce its commitments under the agreement every 60 days until Europe negotiates improved economic terms and offsets the effects of the U.S. sanctions.

In July, Iran breached the pact’s limits on its stockpile of enriched uranium and exceeded a cap on enrichment levels, raising them from 3.67 percent to 4.5 percent. (Weapons-grade uranium is enriched to about a 90 percent concentration of uranium 235, a fissile isotope.) 

On Wednesday, Rouhani gave European nations a new 60-day deadline to salvage the deal. 

French President Emmanuel Macron has recently spearheaded an effort to offer Iran a bailout package in exchange for its full compliance with the nuclear agreement, diplomats said. 

The offer includes a $15 billion line of credit to compensate for lost oil revenue but would depend on a guarantee from the Trump administration not to block the money.

“Our return to the full implementation of the nuclear accord is subject to the receipt of $15 billion over a four-month period, otherwise the process of reducing Iran’s commitments will continue,” Iranian state television quoted Deputy Foreign Minister Abbas Araghchi as saying Wednesday. 

“Either Europe has to buy oil from Iran or provide Iran with the equivalent of selling oil as a credit line guaranteed by Iran’s oil revenue,” Araghchi said. 

As part of the 2015 nuclear deal, Iran agreed to significant restrictions on its atomic energy program in return for widespread sanctions relief. 

The accord states that Iran agrees to “certain limitations on specific research and development (R&D) activities for the first 8 years,” after which it will gradually move to the next stage of its enrichment activities. It also says that Iran will “continue to conduct enrichment R&D in a manner that does not accumulate enriched uranium.” 

The announcement Wednesday could raise tensions with the United States, which has pushed a “maximum-pressure campaign” that it says will persuade Iran to strike a grand bargain on issues such as its nuclear program, ballistic missiles and support for proxy forces in the region.

Rouhani this week ruled out any bilateral discussions with the Trump administration, saying Iran would talk to the U.S. government only as part of multilateral negotiations after all sanctions have been lifted and the Trump administration returns to the nuclear deal. 

Also Wednesday, Sweden’s foreign minister said Iran had released seven crew members from the Stena Impero oil tanker it has held since July. Iranian naval forces intercepted the British-flagged vessel in the Strait of Hormuz. 

Sixteen more members of the crew would remain aboard, a statement from Stena Bulk, which owns the tanker, said, to satisfy a regulation requiring a minimum number of crew members to safely operate the vessel.