Trump said he 'obliterated' Iran's nuclear program. Now he's threatening to bomb again.

Having highly enriched uranium does not mean having a weapon, said Darya Dolzikova​, a senior research fellow with the Proliferation and Nuclear Policy program at the Royal United Services Institute, or RUSI, a London-based think tank. It's just one step in a complex chain, she said in a phone interview Tuesday. "Just enriching to 90% isn't enough. You need to actually build the nuclear warhead. You need to put it on the delivery system," she added. Even if Iran were a week away from having “industrial-grade bomb-making material,” Dolzikova noted that military action and "counterproliferation strikes" are not always decisive responses, pointing to the strikes in June.