China doesn’t have the same record of killing foreign enemies overseas that Russia does. But it has a large enough overseas network and piles of cash that it could get the job done if it needed to. Just ask Naw Kham what happened after the Mekong River Massacre. The bodies of the Chinese, the crew of two cargo boats, were found badly mutilated on the Thai side of the river in early October 2011. The killings, the worst slaughter of Chinese citizens abroad in recent memory, angered the Chinese public. Chinese investigators insist that Mr. Naw Kham was the mastermind...