The mood music coming from the EU regarding The Joint Comprehensive Plan of Action (JCPOA), more commonly known as the Iran nuclear deal, is that if Donald Trump decides to remove the USA from it, the UK, Russia, France, China, Germany and the EU will just carry on without them.
The International Atomic Energy Agency, the organisation tasked with monitoring the use of nuclear technology, confirmed last month that Iran was fulfilling its obligations and Iran’s Foreign Minister, Mohammad Javad Zarif, has said that 'The Europeans have made it very clear to us and to the United States that they intend to do their utmost to ensure survival of the deal'.
The EU has already indicated that it will 'protect our legitimate interests with all the means at our disposal' which includes the same 'Blocking Statute' which the EU used in the 1990s in response to the Clinton administration’s sanctions against Iran.
The EU has also announced that as The JCPOA is a United Nations Security Council resolution, 'It is not a bilateral agreement. It does not belong to any single country and it is not up to any single country to terminate it'.
As the six remaining partners and the IAEA Inspection team agree that Tehran is in full compliance, Trump removing the USA from it will not have any effect as the concerned countries will refuse to comply with any sanctions the US look to impose and isolate Washington, significantly damage its credibility to negotiate future agreements, such as the North Korea deal.
The question i would ask if why America is so keen to scrap the deal which keeps Iran under the cosh and will only lead to escalating tensions and inevitable conflict between Iran and America and probably Israel but then initiating a bit of wide-scale death and destruction on trumped up charges in a Middle Eastern country never stopped either of them before.
It is down to the EU, UK, Russia, France, China and Germany to make sure that America and Israel don't get the war with Iran that they are so obviously hankering after.