The Reagan strike group will conduct a separate drill with the South Korean Navy in October, the defence ministry said in a statement distributed to South Korean lawmakers on Monday.
The 100,000-ton Reagan, which is based in Japan, and its escort ships have been holding drills with Japanese navy vessels since Sept 11 in waters south and west of Japan's main islands, the Japan Maritime Self Defence Force said in a statement.
That exercise with the three Japanese warships, including two destroyers and one of the country's two biggest helicopter carriers, the Ise, will run until Sept 28, it added.
The U.S. and regional allies are responding with military drills, including bomber and jet fighter flights near the Korean peninsula, as Pyongyang pursues its nuclear and missile programs, with an apparent hydrogen bomb test and two ballistic missile firings over Japan in recent weeks.
(Reporting by Tim Kelly and Nobuhiro Kubo in Tokyo; Additional reporting by Christine Kim in Seoul; Editing by Clarence Fernandez)
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