Hassan Nasrallah also claims he doesn't need Iranian arms: 'We have so many missiles, we don't know where to put them'

President appears to link information on Robert A. Levinson to nuclear issue, warning Tehran in tweet against further uranium enrichment

Tehran says Robert Levinson, who disappeared in 2007, being treated as a 'missing person'

In a filing to the UN, Iran gives no further details on case of ex-FBI agent Robert Levinson who disappeared while on an unauthorized mission

FBI says man sent confidential documents to Iran while working at a Michigan company that serves the auto and aerospace industries

Air defenses said to fire at aircraft after it violates country's airspace, near port city of Bandar Mahshahr

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

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

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