FM Zarif says his country may abandon the Non-Proliferation Treaty if 3 EU member states pursue further measures over its alleged violations of 2015 nuclear deal

Amid soaring tensions with US and Europe, and citing an unspecified change to the conference's program, Tehran says top diplomat Zarif will not join the annual event

Foreign Ministry in Tehran rejects 'unfounded' claim by UK, France, Germany that Tehran is violating the 2015 agreement

Parliamentary speaker responds to UK, France, Germany launch of dispute process charging Iran with failing to uphold terms of 2015 nuclear agreement, saying it's 'unfortunate'

Tehran expresses 'surprise' at criticism of probe by countries whose citizens were killed, insists it is engaging in 'far-reaching cooperation'

European Commission President Ursula von der Leyen calls for calm in region, says continued escalation 'in no one’s interest'

Operating secondary heat transfer circuit doesn't violate 2015 nuclear deal, but it is a step closer to producing weapons-grade material

Blasting Trump administration's withdrawal from 2015 pact, Rouhani says no one can blame his country for reducing its commitments to the treaty

Head of the country's atomic energy agency says Iran will stay below 20% threshold; announcement comes as Tehran says it will restart centrifuges at underground Fordo plant

Both Brussels and Moscow urge return to collapsing nuclear accord, though Putin's office says it understand's Tehran's position