The U.S. abandonment of Afghanistan presents an opportunity for China, but one that the communist regime likely will take cautiously. Beyond Afghanistan, a major Chinese propaganda organ already has used the U.S. defeat there to warn Taiwan (which the communist regime claims as part of China) and potentially other countries. China’s diplomats met late last month with Taliban leaders before the U.S. exit. Although Beijing is about 3,400 miles from Kabul, the two countries share a 50-mile border and China is expected to give early diplomatic recognition to a Taliban…