The guided-missile frigates Huangshi (Hull 502) and Xinyang (Hull 501) attached to a frigate flotilla with the navy under the PLA Northern Theater Command steam in formation at an undisclosed sea area during a three-day maritime training exercise from January 8 to 10, 2019. (eng.chinamil.com.cn/Photo by Wang Guangjie and Li Wenlu)
Source：China Military Online
