Destination: Unknown. The Russian nuclear-powered submarine K-561 Kazan is still navigating the Caribbean Sea after it slipped into Havana harbour moorings. The Yasen-class cruise missile underwater vessel is part of a naval group composed of the Frigate Gorshkov, carrying the hypersonic anti-ship missile Zircon, a tug and an auxiliary tanker ship. According to Western military sources, the Saint-Andrew bannered ships could be cruising to Venezuela, another Russian-leaning country in the Americas. Since the start of its travel in the Atlantic Ocean, the Russian naval group has been closely mon…