A Ukrainian official promised an “immediate investigation” Sunday after videos posted on social media allegedly showed captured Russian soldiers being shot in the legs and knees by Ukrainian forces, sparking accusations that war crimes are being committed. “The government is taking this very seriously, and there will be an immediate investigation,” senior presidential adviser Oleksiy Arestovych said on Sunday. “We are a European army, and we do not mock our prisoners. If this turns out to be real, this is absolutely unacceptable behavior.” In a televised speech, Arestovych also said that “torturing a captive is a war crime,” referring to the video footage. “I would like to remind all our military, civilian, and defense forces once again that the abuse of prisoners is a war crime that has no amnesty under military law and has no statute of limitations,” he added in a statement to Telegram. Russia’s investigative committee said through …