"On Monday, Supreme Leader Ayatollah Khamenei said he had ordered preparations to increase uranium enrichment capacity if the nuclear agreement fell apart after the U".
Israeli Intelligence Minister Yisrael Katz called for a military coalition against Tehran if it proceeded with enriching military-grade uranium.
Tehran has said it will stay in the JCPOA if the Europeans give guarantees that a deal without the U.S. would still protect the Iranian interests.
The other parties - Britain, France, Germany, China and Russian Federation - have vowed to stay in the accord but many of their companies have already started to wind down Iranian operations.
French officials said Macron would tell Mr Netanyahu that Iran's threats to increase uranium enrichment pinpointed the need to keep the Iran nuclear deal, in order to prevent Tehran from developing its nuclear arsenal.
"By preventing Iran's military entrenchment in Syria, we're also preventing something that could be very, very unsafe for Europe", he added.
The JCPOA allows Iran to pursue a peaceful nuclear program for commercial, medical and industrial purposes in line with worldwide non-proliferation standards.
The remaining signatories of the deal - France, Germany, Britain, Russia and China - still see the global accord as the best chance of stopping Tehran developing a nuclear weapon and are trying to salvage it.
Big update in the Nabil Fekir transfer saga
Fekir is now with the France squad for the upcoming World Cup having earned his place in Didier Deschamps' 23-man roster. He told Le Progres: "I did not leave Marseille (this weekend), I am with my family.
Mr Salehi stressed the announcement did not mean they will start assembling the centrifuges, and "does not violate the (2015 nuclear) agreement" between Tehran and world powers. Under the global agreement, Iran agreed to dismantle its nuclear program and be subject to monitoring in exchange for the lifting on worldwide nuclear related sanctions.
Supporters also fear the reimposition of U.S. sanctions could hit European firms that have done business with Iran since the accord was signed.
Netanyahu will meet French President Emmanuel Macron on Tuesday and British Prime Minister Theresa May on Wednesday.
European signatories of the accord back the deal but have concerns over Iran's ballistic missile programme and its influence in the Middle East. Iran says the two issues are non-negotiable.
Mr Netanyahu has hit out at Iran's government, declaring the country used its lifted sanctions to trick Europe, and built its financial reserves before beginning to develop its nuclear capabilities.
The sanctions he referred to would be imposed by the United States following President Trump's withdrawal from the JCPOA, so Khamenei was effectively cracking the whip on European leaders to talk Trump out of punishing Iran.
Trump also objected that the 2015 deal, reached under his predecessor Barack Obama, did not address Iran's nuclear work beyond 2025 or its role in conflicts in Yemen and Syria. Iran is trying to pressure the Europeans to come up with a compensation for the USA pulling out.