Is China at war in the South China Sea? You be the judge.

Beyond dispute its conduct is warlike—and that has implications for those resisting its transgressions. On June 19 the BBC chronicled what it termed the latest in a string of encounters between Chinese sea forces, principally the China Coast Guard, and the Philippine Coast Guard and Navy. China Coast Guard cutters intercepted Philippine ships attempting to deliver supplies to Second Thomas Shoal, where soldiers occupy the grounded hulk Sierra Madre to stake Manila’s claim to that contested feature.

The encounter turned ugly. General Romeo Brawner, the Philippine Islands’ seniormost military commander, reported that Chinese vessels rammed their Philippine counterparts, costing one Philippine sailor a thumb. Ramming has been part of the Chinese repertoire for some time. This time, however, Chinese coastguardsmen also brandished bladed weapons such as swords, knives, and spears. According to Brawner, they boarded Philippine ships and made off with weapons and other property. He lambasted the China Coast Guard for “piracy,” adding that “they have no right or legal authority to hijack our operations and destroy Philippine vessels operating within our exclusive economic zone.”

Not quite.

The reality is even worse than General Brawner lets on. Pirates are private seafarers who raid shipping for private gain. The China Coast Guard is a public agency of the People’s Republic of China—in other words, an implement of Chinese statecraft—that’s using methods favored by corsairs since antiquity, against shipping from a neighboring state. Brigandage is Chinese foreign policy in action.

In a sense Beijing has done us all a favor. China-watchers, yours truly among them, have long classed Chinese maritime strategy in the South China Sea as unspooling in a “gray zone” short of open combat. The murk makes it hard for China’s opponents to mount countermeasures: push back too hard against aggression and you look like the aggressor. But the Southeast Asian gray zone is barely gray any more. The situation is resolving into black-and-white clarity owing to domineering Chinese tactics.

Strategic clarity lends itself to solutions.

Still, this doesn’t settle the question whether China is at war. Let’s consult the strategic canon for counsel. In his........

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