‘Severodvinsk’ is too expensive for mass production It’s official. K-560 Severodvinsk, Moscow’s newest and most advanced nuclear attack submarine, has joined the Russian navy. That’s bad news for most countries that could conceivably face Russia in a conflict. The expensive, quiet, 13,800-ton Yasen-class submarine is arguably one of the most sophisticated in the world—and she’s just the first of her class. But the one country that doesn’t have much reason to worry is the United States, which has a significantly larger and more modern submarine force. The Yasen class is also an exception to the rule in Russia, where most...