The Facebook post on Tuesday morning by Prime Minister Dmitri A. Medvedev of Russia was bleak and full of dread. “Blood has been spilled in Ukraine again,” wrote Mr. Medvedev, once favored in the West for playing good cop to the hard-boiled president, Vladimir V. Putin. “The threat of civil war looms.” He pleaded with Ukrainians to decide their own future “without usurpers, nationalists and bandits, without tanks or armored vehicles — and without secret visits by the C.I.A. director.” And so began another day of bluster and hyperbole, of the misinformation, exaggerations, conspiracy theories, overheated rhetoric and, occasionally, outright lies about the political crisis in Ukraine that have emanated from the highest echelons of the Kremlin and reverberated on state-controlled Russian television, hour after hour, day after […]