The US embassy in Tokyo has urged American citizens within 50 miles of the threatened plant to relocate and announced it would help US citizens evacuate the country by plane.
If signed, two proposed military cooperation agreements to deal with North Korea would be the first such agreements between the two nations since Japan’s occupation of Korea in the early 20th century.
US envoy Stephen Bosworth arrives in Tokyo Thursday after visiting Seoul and Beijing. Implicit in his talks is a push for Japan and South Korea to cooperate for mutual defense against North Korea.
Changes to Japan's defense guidelines include shift in focus from northern islands, a cold war concern, to islands in the south, claimed by both Japan and China.
China-US defense chiefs met Tuesday for the first time since Beijing severed links earlier this year. The nations worked to ease tensions over a string of recent maritime disputes in East Asia.