China’s Foreign Minister Wang Yi made an unannounced surprise visit to Afghanistan Thursday, where he held talks in Kabul with Acting Deputy Prime Minister of the Afghan Interim Government Mullah Abdul Ghani Baradar and Acting Foreign Minister Amir Khan Muttaqi. The visit comes seven months after the U.S. withdrew from Afghanistan, leaving behind a power vacuum that China is waiting to fill. China is especially interested in Afghanistan’s mineral wealth, which includes gold, precious stones, coal, oil and gas, lithium, copper and rare-earth minerals. China is not the only power taking advantage of the power vacuum that the U.S. withdrawal...