(Reuters) – The Kremlin said on Monday that Russian investigators would look into a video circulated on social media that purported to show Ukrainian forces mistreating captured Russian soldiers. Kremlin spokesperson Dmitry Peskov said the video contained “monstrous images” and needed to be legally assessed, and that those who took part in what he described as torture needed to be held responsible. Reuters was not able to independently verify the authenticity of the video cited by the Kremlin. Asked about the video during an interview on Sky News, Ukraine’s Prosecutor General Iryna Venediktova…