Russia has tested a new hypersonic anti-ship missile that can travel a blistering 6,138 miles an hour, or 1.7 miles a second. The missile, known as Zircon, will attack ships at sea and land-based targets. It is in all likelihood unstoppable by modern air defenses. CNBC reports that Russia has tested the Zircon anti-ship missile five times, with the latest test occuring on December 10. The December test hit a top speed of Mach 8, or 6,138 miles an hour. CNBC quoted two anonymous U.S. government officials with direct knowledge of an intelligence report on the test. The latest test...