The latest report from the International Atomic Energy Agency confirmed that Iran was still complying with the 2015 Joint Comprehensive Plan of Action (JCPOA) with global powers under which Tehran drastically scaled back its nuclear programme in return for sanctions relief.

The IAEA's latest report showed that over the past three-month period, Iran's stock of heavy water had risen from 122.8 to 124.8 metric tonnes and that it held 163.8kg of enriched uranium, up from 149.4kg in November.

Both levels are within the limits foreseen by the JCPOA.

Last week European states rejected a call from US Vice President Mike Pence to follow the US lead in withdrawing from the Iranian nuclear deal.