Japan may add mention of nuclear subs to key security documents

TOKYO - Japan may refer to nuclear-powered submarines in revised key security documents by year-end, possibly identifying them as a subject for further research and debate as the country seeks to bolster deterrence, sources familiar with the matter said Tuesday.

Some ruling coalition lawmakers want Japan to consider acquiring nuclear-powered submarines, but the issue remains sensitive. Any reference to such vessels in the documents would likely stop short of suggesting that Japan has decided to acquire them, the sources said.