Russia and China are working together to create a next-generation attack sub to bolster their submarine arsenals—and analysts are getting worried.
While the U.S. operates a nuclear-only fleet, Russia and China—along with many other countries—still use nonnuclear subs. They’re cheaper to build and have inshore advantages compared to their nuclear brethren. They’re also easier to sell on the international market, where they don’t have to worry about restriction…

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