Prime Minister Shinzo Abe has expressed concern over the possible nuclear weapons policy of "no first use" being considered by the Obama administration, according to a column in the Monday edition of the Washington Post.

Citing a weakening of deterrence against countries such as North Korea, Abe conveyed his concern to Adm. Harry Harris, commander of the U.S. Pacific Command, columnist Josh Rogin wrote, quoting two U.S. government officials.

Rogin said Abe "personally" conveyed the message to Harris "recently," without providing details. But the two are likely to have discussed the issue during a meeting July 26 at the Prime Minister's Office in Tokyo.