As the U.S., Israel and others try to assess the extent of damage done by the U.S. and Israeli strikes on Iran's nuclear program, several facts need to be established, on top of whether enrichment halls at Natanz and Fordow were rendered inoperable.

U.S. airstrikes did not destroy Iran's nuclear capability and only set it back by a few months, according to a preliminary U.S. intelligence assessment, as a shaky ceasefire brokered by U.S. President Donald Trump took hold between Iran and Israel.