French president urges easing sanctions while pressuring Iranians to negotiate a return; Russia calls on Tehran to uphold commitments to 2015 deal, blames US for situation

Halting uranium enrichment at the heavily fortified Fordo was a major victory for the 2015 nuke deal; its reopening is seen as a dramatic bid by Tehran to leverage sanctions relief

IAEA inspectors on hand for move in latest pullback from nuclear deal; state TV says enrichment comes in reaction to increased US pressure, inactivity of Europe to save the deal

State Dept.: Iran's move will 'deepen its political, economic isolation'; Tehran brags of heavy water sales contravening sanctions; bans cooperation with outlawed UK cultural body

Iran seeks to 'envelop and destroy Israel,' PM warns after Rouhani announces latest violation of 2015 nuclear deal

Head of the country's atomic energy agency says Iran will stay below 20% threshold; announcement comes as Tehran says it will restart centrifuges at underground Fordo plant

Both Brussels and Moscow urge return to collapsing nuclear accord, though Putin's office says it understand's Tehran's position

Where the accord now stands, with Tehran taking another step away from the 2015 agreements to curb its nuclear development

President Rouhani says uranium gas to be injected into 1,044 centrifuges at underground nuclear site

New restrictions come on 40th anniversary of attack on US embassy, and as Iran ups enrichment, targeting senior military officers, chief justice, and advisers to supreme leader