As Washington seeks to call Security Council vote on matter after Tehran breached pact, EU's top diplomat says it has no right because it withdrew from agreement

After US leader hails successful prisoner swap as sign diplomacy can work, Zarif says it's up to the president to fix the broken international accord

Confidential report says Tehran continues to increase its stockpiles of enriched uranium and enriching beyond levels allowed under nuclear deal

Nuclear officials say latest punitive measures against nuclear scientist only increase country's determination to push forward with research

Tehran says measures will have 'no impact' on its continued nuclear work and accuses Washington of pulling the 'final plug' on 2015 nuclear accord

Pompeo says administration will revoke all but one exemption, accuses Tehran of continued 'nuclear brinkmanship' and 'extortion'

Hassan Rouhani offers veiled warning of unspecified steps if international embargo, which is set to expire in October, is extended

US, which has pulled out of JCPOA, is campaigning for extension; Tehran accuses it of 'circumventing' UN Security Council resolution, asks EU for support

Pompeo calls on UN to renew ban on weapons exports, set to expire in October; critics say aim is to kill deal entirely as Trump heads into reelection campaign

Medical goods sent to Tehran using INSTEX, a complicated barter method aimed at enabling commerce with the Islamic Republic without falling afoul of US sanctions