Iranian president says third step away from 2015 nuclear deal will be of 'an extraordinarily significant nature' unless Europe comes up with solution

US president's statement comes after Iranians rule out any high-level bilateral talks without sanctions relief

Washington separately offers $15 million reward for information that could disrupt financial mechanisms of the Revolutionary Guards, including the Quds Force

But deputy foreign minister doubts such a plan can be hammered out before Tehran further reduces its commitments to 2015 pact

President tells lawmakers offers have been made over the years, but he never responds to them, threatens to further reduce commitment to 2015 nuclear deal in coming days

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

In confidential report, International Atomic Energy Agency says Islamic Republic now holds 242.6 kg of enriched material at 4.5% purity

Islamic Republic has twice scaled back its commitment to the 2015 agreement with world powers in recent months

Iranian lawmakers reportedly preparing a resolution condemning and prohibiting further talks with the United States

Ministers said to cite US president's dialogue with North Korea's Kim Jong Un as disturbing precedent, 'but our capacity to influence and confront Trump is extremely limited'