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Europe has a way out of the Iran crisis if Trump plays ball

Europe should develop a de-escalation strategy in case the US or Iran provokes a confrontation.

Before the G7 summit in Biarritz, France, this month, it was a toss-up whether the greater disruption would come from US President Donald Trump or British Prime Minister Boris Johnson. Yet the attendee who had the biggest impact was someone who was not expected to be there at all: Iranian Foreign Minister Javad Zarif.
Although media coverage of the summit focused on trade wars, fires in the Amazon, and the looming danger of a "no-deal" Brexit, the discussions about Iran were probably the most consequential. The fate of the 2015 Iran nuclear deal could determine not only whether the world's most combustible region descends into a nuclear-arms race, but also whether the Western political alliance can survive.
In Biarritz, French President Emmanuel Macron opened the way for a US-Iranian détente. And in recent days, the main players in the Iran drama have all pulled back from the brink. The United Kingdom has released the Iranian tanker (Grace 1) that it seized in Gibraltar. And, more important, Trump has expressed a willingness to meet with Iranian President Hassan Rouhani, even suggesting that he would not object to Iran receiving a "short-term line of credit or loan."
Nonetheless, several factors could derail de-escalation. For starters, the Trump administration remains convinced that the more pressure it puts on Iran (and on America's European allies), the better. US National Security Adviser John Bolton, in particular, wants to asphyxiate the Iranian economy, and believes that cutting off any lifelines from Europe is the way to do it. He and other US officials will use all means at their disposal to chip away at European unity, with the most obvious pressure point being the UK. Worse, beyond applying economic pressure, some in the US - and in the region - also want to set a trap to lure Iran into a military conflagration.
There is also the problem of Iran's hardliners, many of whom feel as though they have gotten nothing from adhering to the nuclear deal, and that the way to build leverage is to become a bigger nuisance. That reasoning has led Iran's leaders to dial up its disruptive activities in a number of theaters, not least by seizing a British tanker in the Strait of Hormuz last month (they, too, have noticed that the UK is Europe's weak link).
Iran's increasing aggressiveness has already raised hackles in Israel, which is reportedly targeting Iranian assets in Iraq (having already launched strikes against Iranian forces in Syria). The danger now is that Iran or its proxies in the Middle East will misread the situation and cross a red line.
Iran has been understandably frustrated by Europe's slow progress in launching Instex, a bartering mechanism designed to allow for some trade between Europe and Iran despite US sanctions. But those in Iran who claim they have gotten nothing from Europe are simply wrong. If the European Union were to abandon its current approach and join Trump in squeezing Iran, they would certainly notice the difference. In fact, by continuing its policy of escalation, Iran risks losing the moral high ground, and thus the support of Europeans who have gone out on a limb to decouple their Iran policy from that of the US.
Europe's ability to maintain support for the Iran deal in defiance of US pressure has surprised many. Even the British government has adhered closely to the EU position so far. But that could change. If Iran were to seize another British ship and hold UK citizens hostage, it could prompt Johnson to break from the EU and adopt the Trump administration's stance.
Given this risk, it is disappointing that France, Germany, and the UK have not launched a joint European mission in the Arabian Gulf, so that an attack on one would be an attack on all.
The Europeans also must persuade the Iranians not to overestimate their own power.
Macron's proposal for a new credit line to Iran could strengthen the position of Iranian moderates, but his credibility in Iran will be diminished if the Europeans cannot get Instex up and running. Finally, Europeans need to keep a close eye on the Arabian Gulf. Even if they aren't going to organize a joint naval force, they should be developing a de-escalation strategy in case the US or Iran provokes a confrontation.
Organizing a naval conference that includes Iran could be a prudent first step.
In broad terms, this is the agenda that Macron will be pushing in the run-up to the United Nations General Assembly meeting in late September. If the strategy succeeds, the Biarritz summit may turn out to be the first successful G7 gathering of Trump's presidency (whether he knows it or not).
- Mark Leonard is Director of the European Council on Foreign Relations.