Japanese Intelligence Tells Pentagon China Engaged in Multi-Year Takeover Attempt of Senkaku Islands

TOKYO—China is escalating a campaign of military maritime coercion against Japan’s Senkaku Islands, according to Japanese intelligence data disclosed as part of a joint Pentagon-Japan research program.

Additionally, China is doubling the size of its coast guard forces over the next five years to prevent the disruption of oil supplies that travel from the Middle East through the Indian Ocean and South China Sea, according to Pentagon-sponsored reports about the joint U.S.-Japan collaboration. Two reports produced by a contractor for the Pentagon’s Office of Net Assessment, a secretive research group, provide a rare glimpse of Japanese intelligence assessments of Chinese military activities in the East China Sea and South China Sea.

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