US experts warm to Japanese nuclear subs as check on China in Asian waters

Vessels would offer greater operability, but face financial, technical challenges A U.S. nuclear-powered submarine. Japan possesses diesel-electric vessels, which have more limited operability. (Photo by Ryo Nakamura) TOKYO/WASHINGTON -- Some experts in Washington, including a U.S. Navy official, are growing receptive to the idea of Japan acquiring nuclear-powered submarines, arguing that the vessels would enable the Japan Self-Defense Forces to deter China more effectively.