Frontier soldiers continue to patrol the China-Russia border in Heihe City, northeast China’s Heilongjiang Province even though the temperatures have fallen below minus 30 degrees Celsius. /VCG Photo

On duty around the clock, the border guards face extreme cold and heavy snow. /VCG Photo

These soldiers are just part of China’s frontier force. From their stations on snow-covered plateaus and dusty deserts, they remain vigilant year round. /VCG Photo