Russia's claim that it launched a hypersonic missile against a military depot in Ukraine has drawn skepticism from Western defense sources who say the alleged strike came from a 1980s-era system that likely did not hit the presumed target. Russia announced on Saturday that it fired its much-vaunted hypersonic Kinzhal missile for the first time in a war setting, demolishing a Ukrainian underground arms warehouse in the country's western sector. The report prompted commentators to note that the attack, if true, in part demonstrated that the U.S. has not kept pace with Russian hypersonic technology. But the Kinzhal is "nothing...