Europe urges Iran to stick to troubled nuclear deal

European powers urged Iran on Tuesday to reverse its move to increase uranium enrichment, as a French envoy arrived in Tehran to boost efforts to save a landmark 2015 nuclear deal.

The accord between Iran and world powers promised sanctions relief, economic benefits and an end to international isolation of the Islamic republic in return for stringent curbs on its nuclear programme.

But Tehran says it has lost patience with perceived inaction by European countries more than a year after President Donald Trump pulled the United States out of the agreement.

The European parties to the deal along with the EU's diplomatic chief on Tuesday called on Tehran to reverse breaches of the agreement.

"The foreign ministers of France, Germany, and the United Kingdom and the (EU) High Representative express deep concern that Iran is pursuing activities inconsistent with its commitments under the Joint Comprehensive Plan of Action (JCPoA)," they said in a statement, using the deal's official name.

"It must act accordingly by reversing these activities and returning to full