Russia said on Wednesday that if the United States stationed missiles in Japan, this would threaten Russian security and prompt Moscow to retaliate.
The Kyodo news agency reported on Sunday that Japan and the U.S. aim to compile a joint military plan for a possible Taiwan emergency that includes deploying missiles.
It cited unnamed U.S. and Japanese sources as saying that under the plan, the U.S. would deploy missile units to the Nansei Islands of Kagoshima and Okinawa prefectures, and to the Philippines.