The UK, France and Germany have termed Iran's decision to expand its nuclear program in response to the UN's resolution as violation of Joint Comprehensive Plan of Action requirements.

In a joint statement, E3 countries said accelerating its production of enriched uranium; Iran has taken further steps in hollowing out the JCPoA.

The UN watchdog's 35-member board of governors passed the resolution last week, asking Iran to urgently cooperate with its investigation into uranium traces found at three undeclared sites.