A shocking video of a Russian mercenary playing with the skull of a Ukrainian fighter while declaring the objective of killing as many Ukrainian soldiers as needed to "de-Ukrainize Ukraine" was published by Ukrainian journalist and writer Denis Kazansky on Sunday. The fighter, identified as Moscow native Igor Mangushev by Kazansky, gave a speech in what appeared to be a club, holding the skull in the fashion that William Shakespeare's Hamlet held the skull of Yorick. "We're alive, and this guy's already dead," Mangushev reportedly said. "Let him burn in hell. He wasn't lucky. We'll make a goblet out of...