The JCPOA deal, signed by Iran and P5+1 powers (China, France, Russia, the United Kingdom, the U.S., plus Germany) in 2015 after years of hard negotiations, saw global sanctions on Tehran lifted in exchange for Iran curbing its controversial nuclear program.
The US commitment to fighting climate change - forged under former president Barack Obama - was reversed in June 2017, when Trump announced he would withdraw America from the Paris pact.
But Iran's supreme leader, Ayatollah Ali Khamenei, doesn't appear to have much faith.More news: Brooklyn Nine-Nine Cancelled, but it Might not be the End
Iran's supreme leader has challenged President Donald Trump over America pulling out of nuclear deal, saying: "You can not do a damn thing!"
Trump's action will reinstate economic sanctions against Iran, pledge new ones and increase the risk of confrontation with an Iranian regime that has shown little interest in peaceful cooperation.
He said the TPP - which has yet to take effect but has been signed by participating nations - left the United States exposed to unfair competition and was a bad deal.
Taken overall, transatlantic tensions will now jump again following Trump's decision over Tehran and this could make for a tricky G7 summit next month.
While the chants of "Death to America" were few, Iranians are sincerely angry over Trump's decision and many are siding with the hard-liners, who have always been suspicious of the West.More news: Lawyer: I Discussed Accusations Against Schneiderman With Michael Cohen In 2013
Now, Mr. Trump has decided and no one knows what's next.
Iranian President Hassan Rouhani ordered his diplomats to negotiate with their European, Russian and Chinese counterparts, though he threatened that Iran would commence unlimited uranium enrichment if the continued negotiations do not yield results within several weeks.
Media captionAnalysis: What's next for the Iran deal?
"The impact (of new sanctions) in India will be there, but not so high", said R Ramachandran, head of refineries at state-owned oil firm Bharat Petroleum Corp.
Mr. Trump said he'd reimpose sanctions - but it seems the Europeans won't.
Last week, a senior Israeli intelligence official was in Ottawa to garner support for his government's opposition to the Iran agreement.
Johnson had been involved in negotiations with European countries working to save the deal.More news: Giuliani resigns from law firm due to 'pressing demands' of Mueller probe