The United States and its key European allies clashed with Iran and Russia over Tehran's expanding nuclear programme, with the US vowing to use all means necessary to prevent a nuclear-armed Iran in a UN Security Council meeting on Monday.
The US, France, Britain and Germany accused Iran of escalating its nuclear activities far beyond limits it agreed to in a 2015 deal aimed at preventing Tehran from developing nuclear weapons, and of failing to cooperate with the UN nuclear watchdog, the International Atomic Energy Agency.
Iran and Russia accused the US and its allies of continuing to apply economic sanctions that were supposed to be lifted under the deal, and insisted that Tehran's nuclear programme remains under constant oversight by the IAEA.
The clashes came at a semi-annual meeting on implementation the nuclear deal between Iran and six major countries the US, Russia, China, Britain, France and Germany known as the Joint Comprehensive Plan of Action.
Under the accord, Tehra
