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Ruda ("Redhead") is a medic from the 73rd Special Operations Forces Centre who works in the hottest spots of the combat zone together with her fellow medics. She meets soldiers who come back from a combat mission "with barotraumas, shrapnel wounds and many more things" almost every day, she says in a video published by the Special Operations Forces of Ukraine (SOF).

Ukraine’s SOF operators once learned advanced tactics from US and UK experts. Now, with combat experience, Ukrainians are teaching their SOF counterparts a thing or two.

By the very nature of covert operations, details of Ukraine and Russia's Special Operations Forces (SOF) and their activities in the on-going war are murky. Here, MailOnline looks at what we do know.