One of the most secret weapons to combat Russia's invasion of Ukraine has started to raise its profile.
A new video posted on social media seeks to promote the covert activities of a network of Ukrainian civilians, living - and fighting - behind Russian lines.
Run by the Ukrainian special forces, this resistance movement is growing, according to its commander, who said any adult - old, young, male, female - can join.
They just need to be loyal to Ukraine - and brave.
Read the first-ever interview with the special forces commander who heads this network here...
