The documentary tells the stories of two Russian men who say they help Ukraine collect intelligence on Russian military targets, risking lengthy prison sentences if they are discovered.
Titled Shadowmen: Russians Working with Ukraine, the documentary follows the two men as they describe their efforts to help defeat the Russian army and bring an end to the rule of President Vladimir Putin.
They say they gather information about Russian military personnel and help Ukrainian intelligence prepare attacks on military targets inside Russia.
'Methods intended to speed up regime change'
One of the men, identified as Ivan, is a former Russian opposition activist who has left the country. He says he decided to speak publicly to show that some Russians are also helping Ukraine.
"We started protesting to change the country. Now we are using methods intended to speed up regime change," Ivan says in the documentary.
The second man, identified as Foma, lives in Poland. He claims to lead a network of volunteers who gather information about Russian military officers and pass it to Ukrainian intelligence.
Foma stresses that his network does not carry out attacks itself but provides intelligence that can help Ukrainian forces plan operations.
The documentary also examines the risks involved in the men's activities and questions how reliable their accounts are.
Ukraine's military intelligence service confirms that it works with both men. However, the officer handling Ivan acknowledges that he cannot rule out the possibility that Ivan is also working with Russian intelligence services.
The BBC said it could not independently verify the men's accounts of specific operations.
The documentary offers a glimpse into a covert dimension of the war, in which people gather information that may be used by Ukrainian intelligence against Russian military targets.
Shadowmen: Russians Working with Ukraine is available on YouTube and, in the United Kingdom, on BBC iPlayer.
An audio version is available through the BBC World Service documentary podcast.
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Source: polskieradio24.pl, bbc.com