After Helsinki meeting, German FM says signatories want to build on momentum from last weekend's G7 summit, where Trump indicated willingness to talk to Tehran

Tehran pessimistic about deal's prospects, while Europeans plan to raise subject of Iran's 'proven violations of their commitments' amid rising Gulf tensions

Netanyahu says Tehran seeking to signal it could move towards a bomb, adding that it would take several years and Israel will 'make sure it doesn't happen'

Moscow says Tehran breaching uranium enrichment cap a consequence of withdrawing from 2015 deal; Beijing accuses Washington of 'unilateral bullying' of Islamic Republic

Tehran gives Europe 60 days to save faltering agreement; its atomic agency suggests enriching uranium to 20% in next stage of reducing commitments to 2015 pact

Tehran confirms surpassing limit set by nuclear agreement as foreign ministry gives Europe 60 days to salvage 2015 pact

As Tehran set to violate key provision of nuke deal following 60-day ultimatum, Pompeo urges world to clamp down on Islamic Republic

Apparent violation of the pact comes a week after Tehran announced it had exceeded its caps on stockpiling low-enriched material

Tehran claims increase for "peaceful' purposes, accuses US and Europe of breaking nuke deal commitment, but move likely to further ratchet up tensions

Top aide to Khamenei accuses Europeans of having 'indirectly violated' nuclear deal, says upping enrichment beyond terms of pact backed 'by every component of the establishment'