BRUSSELS (Dispatches) -- China, Russia, France, Germany and Britain will meet with Iran in Vienna on Feb. 26 to discuss how to uphold the 2015 nuclear deal with Tehran, the European Commission said in a statement on Tuesday.
Britain, France and Germany formally accused Iran on Jan. 14 of violating the terms of the 2015 nuclear program in order to pave the way for possible reimposition of UN sanctions lifted under the 2015 deal.
The European Union will extend indefinitely the time limit to resolve disputes in the Iran 2015 nuclear accord to avoid having to go to the UN Security Council or triggering new sanctions, the EU’s top diplomat Josep Borrell said during a visit to Tehran on Feb. 4.
In a statement on Monday, the European External Action Service (EEAS) said, "The Joint Commission will be chaired on behalf of the EU High Representative Josep Borrell Fontelles by EEAS Secretary General Helga Maria Schmid and will be attended by representatives of China, France, Germany, Russia, United Kingdom and Iran.”
The nuclear deal has been slowly crumbling since U.S. President Donald Trump withdrew from it in May 2018 and reimposed unilateral sanctions on Iran.
Iran waited for more than a year

 after the U.S. withdrawal for France, Britain and Germany to protect Tehran’s business interests under the deal from the American sanctions, but decided to scale back its commitments after the Europeans did nothing in practice.  
Iran announced on January 5 that it would take the fifth and final step in scaling back its commitments.
Earlier this month, Foreign Minister Muhammad Javad Zarif reiterated Iran’s readiness to reverse its retaliatory measures against the EU’s violation of the nuclear deal if Europe provided "meaningful” economic benefits to the country.
In a statement on January 24, the European Union said it would give its members more time to discuss, under the dispute mechanism enshrined in the deal, possible ways to preserve the JCPOA.
"There is agreement that more time is needed due to the complexity of the issues involved. The timeline is therefore extended,” Borrell said then.