UKRAINE compared Russia to Islamic State and called on the International Criminal Court to investigate after a video emerged online showing apparent Russian soldiers filming themselves beheading a Ukrainian captive with a knife. Reuters could not immediately verify the authenticity or provenance of the video on social media, which showed a man in uniform beheading a man who wears the yellow arm band used by Ukrainian soldiers. The Kremlin described the video as "awful" but said its authenticity needed to be checked. Moscow has denied in the past that its troops carry out atrocities during the conflict. "There is something…