The two powers have been exchanging barrages since Israel attacked Iran and killed many of the country’s top military leaders and scientists.

President Donald Trump said the United will come down on Iran “at levels never seen before” if the Middle Eastern country attacks.

Israel’s airstrikes damaged Iran’s nuclear program but likely fell well short of eliminating it, experts said, presenting Prime Minister Benjamin Netanyahu and the US with a quandary on what to do next.

The nation’s nuclear program had somehow evaded decades of Western scrutiny and ignored non-proliferation treaties to produce a viable bomb. Iran now sat among the exclusive group of nations with the power to deploy the most fearsome of weapons,

The U.S. was represented at the UN Security Council's emergency session on Friday by State Department Senior Bureau Official McCoy Pitt, who said the U.S. was advised by Israel that the actions carried out against Iran overnight were "necessary for its self-defense."

On the heels of Israel's strikes on Iran over its nuclear program, here's a look at which nations currently possess nuclear weapons.