Frontier defense soldiers assigned to a border defense regiment with the Shannan Military Sub-command under the PLA Tibet Military Command patrol the snow-blanketed border at the elevation of over 5,000 meters in Tibet Autonomous Region on January 23, 2021. (eng.chinamil.com.cn/Photo by Zhang Zhaojie)

Frontier defense soldiers assigned to a border defense regiment with the Shannan Military Sub-command under the PLA Tibet Military Command patrol the snow-blanketed border at the elevation of over 5,000 meters in Tibet Autonomous Region on January 23, 2021. (eng.chinamil.com.cn/Photo by Zhang Zhaojie)

At the elevation of over 5,000 meters in Tibet, frontier defense soldiers assigned to a border defense regiment with the Shannan Military Sub-command under the PLA Tibet Military Command trudge along in the waist-deep snow during a snow patrol on January 23, 2021. (eng.chinamil.com.cn/Photo by Zhang Zhaojie)