Russian President Vladimir Putin said on Monday that Russia is stepping up production of its Oreshnik intermediate-range hypersonic missile, which it launched for the first time against Ukraine last November. "Serial production of the latest Oreshnik medium-range missile system is under way," Putin told a graduating class of military cadets in televised comments. The system has "proven itself very well in combat conditions," he added. -snip- Putin has boasted that the Oreshnik is impossible to intercept and has destructive power comparable to a nuclear weapon, although some Western experts have cast doubt on those claims. In December, a U.S. official...