Iran nuclear talks: agreement in reach, says Russia, as negotiations resume

 Ministers to reconvene in Lausanne on Wednesday morning after pushing through deadline on night of exhaustive diplomacy.

The Russian and Iranian foreign ministers have claimed there has been a significant breakthrough at nuclear talks in Lausanne, which resumed on Wednesday morning.

American diplomats denied the agreement had been finalised, saying there were still issues to resolve. But in a sign the talks could be approaching a critical moment, Barack Obama held a video-conference on Tuesday night with his national security team to be briefed on developments by the US negotiators: the secretary of state, John Kerry, and the energy secretary, Ernest Moniz.

The talks went past a midnight deadline but appeared to have gathered momentum as they approached the cutoff point.

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