China’s foreign minister, Wang Yi, recently declared that aggression and expansionism have never been in the Chinese nation’s “genes.” It is almost astonishing that he managed to say it with a straight face.

Aggression and expansionism obviously are not genetic traits, but they appear to be defining President Xi Jinping’s tenure. Xi, who in some ways has taken up the expansionist mantle of Mao Zedong, is attempting to implement a modern version of the tributary system that Chinese emperors used to establish authority over vassal states: Submit to the emperor, and reap the benefits of peace and trade with the empire.

For Xi, the COVID-19 pandemic — which has preoccupied the world’s governments for months — seemed like an ideal opportunity to make quick progress on his agenda. So, in April and May, he directed the People’s Liberation Army (PLA) to launch furtive incursions into the icy borderlands of India’s Ladakh region, where it proceeded to establish heavily fortified encampments.