A Russian man working undercover for Ukrainian intelligence has provided the BBC with footage of reconnaissance operations in Russia.

A man we'll call "Ivan" says he was involved in Ukrainian drone attacks against Russian strategic bombers and weapons factories from inside Russia.

Ivan was featured in the BBC World Service documentary ``Shadowmen: Russians working with Ukraine'' about saboteurs working in Russia.

Ukraine's Ministry of Defense's General Directorate of Intelligence (GUR) confirmed that Ivan was working for them.

However, Ivan's GUR coordinator said there was a possibility that some of the Russian agents were double agents for the Russian side.

Both GUR and Ivan are cautious about how much detail they share, making it impossible to verify Ivan's claims about his activities.

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