Chinese and Russian military personnel communicate on a joint military drill at a training ground on Aug. 5, 2021. A joint military exercise by the Chinese and Russian armies will be held from Aug. 9 to 13 at a training base of the People's Liberation Army (PLA) in northwest China's Ningxia Hui Autonomous Region. (Photos: Xinhua)

A Russian Su-30 fighter conducts adaptive training for a joint military drill with China on Aug. 4, 2021. A joint military exercise by the Chinese and Russian armies will be held from Aug. 9 to 13 at a training base of the People's Liberation Army (PLA) in northwest China's Ningxia Hui Autonomous Region.

Russian military personnel conduct adaptive training for a joint military drill with China on Aug. 2, 2021. A joint military exercise by the Chinese and Russian armies will be held from Aug. 9 to 13 at a training base of the People's Liberation Army (PLA) in northwest China's Ningxia Hui Autonomous Region.

Military personnel prepare equipment for a joint military drill by the Chinese and Russian armies on Aug. 5, 2021. A joint military exercise by the Chinese and Russian armies will be held from Aug. 9 to 13 at a training base of the People's Liberation Army (PLA) in northwest China's Ningxia Hui Autonomous Region.