Shortly after the Russian invasion began, unconfirmed rumors spread widely across the internet of a mysterious Ukrainian fighter pilot in a MiG-29 gunning down six enemy aircraft within the first hours of the war. The unknown military hero, dubbed "The Ghost of Kyiv" on social media, had been taking to the skies since the invasion started and allegedly reached 21 confirmed Russian aircraft kills as of Wednesday, making the pilot the first supposed flying ace of the 21st century. "The Ghost of Kyiv," however, is almost certainly a myth, albeit an incredibly useful one as Ukraine tries to rally its...