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Zhaotou-class cutter - Wikipedia
Note that the designation of the second ship in the class (nicknamed the 'Monster' by those who have had the misfortune of encountering it) class seems to have recently changed from CCG 3901 to CCG 5901.
CHINACOASTGUARD5901, Patrol Vessel - Details and current position - IMO 9756028 - VesselFinder
Vessel CHINACOASTGUARD5901 (IMO 9756028, MMSI 413482360) is a Patrol Vessel built in 2016 and currently sailing under the flag of China.

China's Ships Are Winning the Battle for Energy in South China Sea
By Philip Heijmans (Bloomberg) — This was supposed to be the year that Vietnam reaped the benefits from one of its largest natural gas discoveries. An estimated 150 billion cubic meters...

One tool China has frequently used to enforce its claims near Vietnam is the CCG 5901, a coast guard vessel based out of Hainan Island that is better known as the “Monster.”
Bigger than a US Navy destroyer, the Monster is a 12,000-ton patrol vessel armed with anti-aircraft guns and fuel storage capacities enabling it to undertake extended missions. It regularly sails in and around the energy-rich waters Vietnam has spent years trying to develop. The Monster is just one of the vessels China uses to enforce its claims, and the kind of ship smaller Southeast Asian nations can’t compete with.