Tehran is trying to gain leverage in expected negotiations with the US, experts say; but it's also gradually advancing its nuclear weapons capability: 'We are getting 2030 in 2020'

47 out of required 50 countries have ratified pact, which Iran supported and Israel boycotted; Friday eyed as target date to complete process

FM Zarif says his country may abandon the Non-Proliferation Treaty if 3 EU member states pursue further measures over its alleged violations of 2015 nuclear deal

Noting Israeli accusations against Iran, Foreign Policy magazine slams 'humiliating role' US president allegedly played in hiding purported Israeli test from the world

Questions abound as PM exposes site where he says experiments to develop nuclear weapons were conducted: Why now? Was Trump told? Which experiments? And what else does Israel know?

Nuclear Nonproliferation Treaty members -- every nation but India, Pakistan, North Korea and Israel -- gather every five years to examine how pact is working

Iran's foreign minister says leaving the pact is one of Tehran's 'many options' to retaliate against US sanctions