Brisbane, Australia CNN  —  Australia is working to verify the authenticity of a video that purportedly shows one of its nationals captured by Russian forces while fighting in Ukraine. The video, posted to Russian Telegram accounts, shows a man with a muddied face being questioned in a forested area by another man speaking Russian, who appears to hit him twice across the head. The man, whose hands appear to be tightly bound with silver tape, identifies himself on camera as 32-year-old Oscar