The inescapable conclusion is that since 2008 China’s leaders have abandoned the “peaceful rise” policy that Deng Xiaoping launched in 1978 and senior strategist Zheng Bijian spelled out in 2003. To rise economically, China needed a receptive world environment in which its exports, imports and incoming investments would be unimpeded. Deng’s policy—threaten nobody, advance no claims and don’t attack Taiwan—was brilliantly successful, as the U.S. actively favored China’s economic growth and other countries followed suit, to the great benefit of the Chinese people, and us all.

Everything changed after 2008. Interpreting the global financial crisis as a harbinger of collapsing American power, Beijing abruptly revived its long-dormant claim to most of the Indian state of Arunachal Pradesh, rebuffed friendly overtures from Japanese politicians and instead demanded the Senkakus, and declared ownership of vast portions of the South China Sea hundreds of miles from any Chinese coast but well within the exclusive economic zones of the Philippines, Brunei, Malaysia, Indonesia and Vietnam.

China’s demands are now asserted even on its passports, which are decorated with a map that on close inspection includes South Korean waters. …