Iran's nuclear programmes have generated a lot of crisis in the Middle East.
The U.S. and Israel have complained that the deal lasts only for a number of years, does not sufficiently include inspections of Iranian nuclear-related sites and operations, and does not address Tehran's destabilizing military activity in the region and the world.
In triggering the dispute mechanism, "our three countries are not joining a campaign to implement maximum pressure against Iran".
The three European signatories now say they have "no choice" but to trigger the mechanism.
The strategic aim for the United Kingdom, and our worldwide partners, remains as it has always been: to de-escalate tensions, to hold Iran to account for its nefarious activities, and to keep the diplomatic door open for the regime to negotiate a peaceful way forwards.
Broader confrontation with U.S..
After its top general was killed in a US drone attack earlier this month, Iran announced what it said was its fifth and final step in violating the deal, saying it no longer will abide by any limitation to its enrichment activities. Since that time, Iran and the JCPOA's European signatories attempted to negotiate tools with which Iran could be shielded from USA sanctions, but these have proven insufficient.
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In Jerusalem, Israeli Prime Minister Benjamin Netanyahu said Israel would not allow its arch-foe Iran to obtain nuclear weapons and called on Western countries to impose "snapback sanctions" on Tehran under the previous United Nations resolutions.
The United States unilaterally pulled out of the multilateral nuclear deal in May 2018 and re-imposed crippling sanctions on Iran.
Mr Raab added: "We urge Iran to work with us to save the deal". He was filmed with Canada's Prime Minister Justin Trudeau and France's President Emmanuel Macron mockingly discussing Trump's behaviour at the North Atlantic Treaty Organisation summit in December.
The 2015 nuclear deal - known as The Joint Comprehensive Plan of Action (JCPoA) - has a provision that allows a party to claim significant non-compliance by another party before a joint commission.
The move makes it more hard to keep the agreement alive. If it cannot be solved, the matter could be brought before the U.N. Security Council and could then result in the snapback of sanctions that had been lifted under the deal.
Analysts have said the Europeans still have an opportunity to press for diplomacy, with Tehran on the defensive after admitting shooting down the airliner.