Iran now says it wants to return to the nuclear negotiating table with the US. For nuclear weapons expert Kelsey Davenport, that's still the best possible option for both sides because it'll put the breaks on the atomic program and give the Iranians some badly needed US economic sanctions relief. Diplomacy, she says, is always the best way because when the US and Israel have tried cyber-espionage and killing Iran's nuclear scientists, it's resulted in the Iranians doing exactly what they're not supposed to under the terms of the 2015 deal. "All options are on the table [and] those options are on the table, but they're not good options." She spoke in an interview with Ian Bremmer on an episode of GZERO World.

Watch the episode: Nuclear weapons: more dangerous than ever?