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The US Attorney General Jeff Sessions has seemingly bowed to pressure even from some within his own party, and said he will step back from FBI investigations into alleged Russian meddling in the US election. Is that enough? We speak to William Danvers, a former US intelligence official and senior fellow at the Washington policy institute, American Progress.

Also, we examine the ongoing investigations into alleged Russian cyber-espionage. Shawn Henry is a former deputy director at the FBI. He's now president of services at CrowdStrike, the US-based internet security firm. His company first announced the suspected Russian link in the hack of Democratic Party computers last year. How certain could he or anyone be about the perpetrator of a hack, and how might all governments and companies protect themselves in future against government-led cyber-attacks?

On this theme, we also talk to William Saito, a cyber-expert and advisor to the Japanese government. And we hear from Staffan Truve, chief scientist and co-founder of Recorded Future, one of a new wave of technology firms hoping to deploy artificial intelligence to bolster cyber-defences. How does it work, and is this the future of cyber security?

(Picture: Russian nesting dolls, including one showing Vladimir Putin on a mobile phone; Credit: Streeter Lecka/Getty Images)