The Qushan and the Haimen have frequently taken part in patrols in disputed waters in the East China Sea and the South China Sea.
The two vessels were registered with the North Pacific Fisheries Commission as inspection vessels to have the power to board and inspect civilian ships on the high seas.
China has four coastguard vessels registered with the commission, with the other two being the Changshan and the Shicheng.
In July 2021, the Qushan and the Haimen carried out the first such patrols by the Chinese coastguard.
In a 31-day journey, the vessels sailed through the straits of Tsushima, Tsugaru and Osumi, the international sea channels near Japan to and from the Pacific Ocean.
They observed and recorded a total of 111 fishing vessels, and boarded three of them for inspections.
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