Oman has helped facilitate back-door diplomacy between the US and Iran; senior visit raises speculation of Oman's future involvement in Vienna negotiations

Former PM lambastes nascent deal being negotiated in Vienna, claiming it only delays Iran by a few years while giving their nukes a 'kosher seal of approval'

Opposition leader tells lawmakers that only crippling sanctions and a credible military threat will hold back Tehran from obtaining atomic weapons

Amid signs that deal to restore 2015 pact could soon be reached, State Department touts diplomacy and coordination with regional allies as 'the best way to achieve our goal'

Sources quoted saying new accord doesn't address advances Tehran has made since 2015, US administration 'turning diplomacy into a religion'

Speaking to US Jewish leaders as progress is made in Vienna talks, PM pledges that Israel is up to the growing challenge

Foreign minister tells CNN that Western powers need to be 'realistic' but Tehran is serious about wanting to reach an agreement

At Munich Security Conference, German chancellor criticizes Tehran for stepping up enrichment, restricting inspections by monitors from UN nuclear agency

TV network cites Israeli security officials warning that revived agreement won't take into account the nuclear gains Tehran has made since Trump withdrew from the accord in 2018

Outline detailed by Reuters reportedly provides for Iran's release of Western prisoners, subsequent gradual waiving of sanctions