On Dec. 9, China Coast Guard vessels fired water cannons at Philippine supply ships in the Scarborough Shoal, where the Philippine ships had arrived to resupply fishermen. That’s just the latest skirmish in the disputed atoll, which is located near the Philippines but was seized by China in 2012. In fact, in recent months, China has markedly increased its maritime bullying in the waters off the Philippines. That trend is already beginning to spread nervousness among Western businesses interested in friendshoring some of their operations to the Philippines—which may be precisely what China is after.

On Dec. 9, China Coast Guard vessels fired water cannons at Philippine supply ships in the Scarborough Shoal, where the Philippine ships had arrived to resupply fishermen. That’s just the latest skirmish in the disputed atoll, which is located near the Philippines but was seized by China in 2012. In fact, in recent months, China has markedly increased its maritime bullying in the waters off the Philippines. That trend is already beginning to spread nervousness among Western businesses interested in friendshoring some of their operations to the Philippines—which may be precisely what China is after.

The water-cannon attack on the Philippine supply ships, which resulted in one of the vessels suffering engine damage and having to be towed back to port, came only a few weeks after two other heavy-handed actions by Chinese vessels near the Philippine coast.

In late October, a Philippine supply vessel and a vessel from the Philippine Coast Guard were bumped, respectively, by a China Coast Guard vessel and a vessel belonging to China’s maritime militia. The incidents took place near the Second Thomas Shoal, in waters that both the Philippines and China consider their own. In 2016, the tribunal in charge of enforcing the United Nations Convention on the Law of........

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