Iran has warned to withdraw from the Non-Proliferation Treaty (NPT) if the European Nations refer the dispute over its atomic programme to the United Nation Security Council.
Britain, France and Germany launched a process last week charging Iran with failing to observe the terms of the 2015 nuclear deal.
This move could eventually see the Security Council reimpose international sanctions on the country.
The landmark 2015 deal reached with Britain, China, France, Germany, Russia and the United States gave Iran relief from sanctions in return for curbs on its nuclear programme.
About
The NPT is a multilateral treaty aimed at limiting the spread of nuclear weapons.
The treaty was signed in 1968 and entered into force in 1970.
The Treaty defines nuclear weapon states (NWS) as those that had manufactured and detonated a nuclear explosive device prior to 1 January 1967. All the other states are therefore considered non-nuclear weapon states (NNWS).
The five nuclear weapon states are China, France, Russia, the United Kingdom, and the United States.