Iran’s stockpile of uranium enriched just below the level needed for nuclear weapons surged more than 50% in the last three months, defying mounting pressure on the Islamic Republic to curb its atomic activities.

The International Atomic Energy Agency (IAEA) said Iran is taking steps to accelerate its near weapons-grade uranium in a broader effort to expand its capability for nuclear warfare, according to ...

VIENNA — Iran has accelerated its production of near-weapons-grade uranium as tensions between Tehran and Washington rise since the election of President Trump, a report by the United Nations ...