Vladimir Putin's hypersonic missile carried a simple message to the West over Ukraine: back off, and if you don't, Russia reserves the right to hit U.S. and British military facilities. -snip- "Putin is saying to the West stop - halt - back off," Sergei Markov, a former Kremlin adviser, told Reuters. "The signal Putin is sending to the world is that we consider these strikes as the direct entry of the United States and Britain into a war against Russia," he said. "But we are not responding with all our might right now because these strikes against Russia will not...