In a speech broadcast on national television, Rouhani said he had written to the remaining signatories saying Tehran would start rolling back on its commitments by stopping selling enriched uranium and heavy water to other nations. Geranmayeh said Tehran is trying to convince Beijing to buck USA sanctions pressure and keep buying Iranian oil to keep its economy afloat but that China, now in the middle of a contentious trade war with the United States, has less room to thumb its nose at Washington than it did in the past.
He accused "hardliners" in the United States of working to undermine the deal, saying it was "in the interests of the region and the world, but not the enemies of Iran, therefore they spared no effort since 2015 to undermine (the deal)". The return of US sanctions has been damaging to Iran's economy.
Meanwhile, Rouhani and Foreign Minister Mohammad Javad Zarif - who once claimed to be close to reformists - have shed their reputation as moderates in the Iranian political landscape.
After the 2015 Iran nuclear deal was implemented, Iran's economy revived and its GDP grew by 13 percent in 2016, according to data from the International Monetary Fund (IMF).
"We will not allow Iran to achieve nuclear weaponry".
In a speech broadcast on national television, Rouhani said the remaining signatories - Britain, France, Germany, China and Russian Federation - had 60 days to make good on their promises to protect Iran's oil and banking sectors. It has revoked waivers that had allowed some countries to continue buying Iranian oil and it aims to reduce Iranian crude exports to zero.
World powers have "a narrowing window to reverse this", Zarif added.
Under the deal, Iran agreed to check its nuclear activities in return for an easing of sanctions. The well trailed announcement came as Washington stepped up its rhetoric against Tehran, accusing it of planning "imminent" attacks and deploying an aircraft carrier strike group with several nuclear-capable B-52 bombers to the region.
Chinese Foreign Ministry spokesman Geng Shuang called "on all parties concerned to exercise restraint" and avoid escalation, saying the us has "further aggravated" tensions regarding the Iran deal.
The letters will come as officials in the Islamic Republic previously warned that Iran might increase its uranium enrichment, potentially pulling away from a deal it has sought to salvage for months. Weapons-grade uranium needs to be enriched to around 90pc.
French Defence Minister Florence Parly echoed the German foreign minister's words, saying that the European Union "absolutely [wants] to keep this agreement alive" in an interview with BFMTV, further adding that "nothing would be worse than Iran leaving this deal". Already, the White House has announced the deployment of a U.S. aircraft carrier and a bomber wing to the Persian Gulf over unspecified threats from Iran.
NIAC founder Trita Parsi said in a series of tweets Wednesday that Iran's decision to take concrete steps in response to the Trump administration's hostile and risky behavior is "not surprising".
In response to the U.S. moves, the Iranian parliament also passed a bill blacklisting the U.S. Central Command (CENTCOM) forces in West Asia as a "terrorist group", pledging to fight back any provocation by Washington.