As talks to revive Iran nuclear agreement in home stretch, Chris Murphy says US doesn't have luxury of bringing back conditions under which accord was signed due to Trump pull-out

Grossi vows IAEA will 'never abandon' its attempts to clarify the presence of nuclear material at several undeclared Iranian sites, as Tehran urges closure of probe

Senate majority leader, who was one of four Democrats to vote against 2015 pact, makes first public comments on matter since coming out against Trump's 2018 withdrawal

Bennett: We're 'one of the few that can communicate directly with both parties, and assist where requested. And we do help, quietly'

Paris points to 'urgency' in concluding talks, as all sides signal progress; Iran's chief negotiator returns to Vienna after returning home for consultations

Ali Bagheri heads back to talks in Austria with 'clear instructions' to work to 'solving problems in order to reach an agreement,' according to Iranian state media

Foreign Minister Amir-Abdollahian says ready to 'immediately conclude a good deal' if Western parties show 'real will'

Degree of Putin's frustration with US opposition to his incursion will dictate whether he prioritizes deal to prevent nuclearized neighbor over effort to push back against the West

Ali Bagheri warns that no matter how close talks in Vienna are to revival of 2015 pact, they can still fail until agreement is inked; top Iranian nuclear official to meet with IAEA

As agreement seems to come together, Iranian top diplomat says Tehran won't give up its 'red lines' in negotiations