In a sign that perhaps a video purportedly showing the execution of two men at the hands of a separatist leader called “Demon” is real, acting President Oleksandr Turchynov in an official statement vowed to avenge the men’s deaths and said he holds Russia’s leadership responsible for their execution.

In the video, published to YouTube, the two men, who are not recognizable

but are believed to be Vasyl Budiak, a Ukrainian activist, and Oleksandr Vasiiushchenko, the head of the local Security Service of Ukraine department in

Artemivsk, Donetsk Oblast, stand facing a black wall in a darkened room with

bags over their heads and their hands tied behind their backs.