Naval vessels attached to an auxiliary ship group under the PLA Southern Theater Command perform alongside liquid cargo replenishment-at-sea during a maritime training exercise in mid- April, 2021. Photo: China Military Online

Naval vessels attached to an auxiliary ship group under the PLA Southern Theater Command perform alongside liquid cargo replenishment-at-sea during a maritime training exercise in mid- April, 2021. Photo: China Military Online

Naval vessels attached to an auxiliary ship group under the PLA Southern Theater Command perform alongside liquid cargo replenishment-at-sea during a maritime training exercise in mid- April, 2021.Photo: China Military Online