Recently the China Coast Guard and the Russian Coast Guard held joint exercises in the Peter the Great Gulf near Vladivostok. After the exercise, they formed a joint task force. 

Also wanted to identify the China Coast Guard Cutters seen in the video.

They are Zhaoduan class Type 818, derived from the PLAN Type 054A frigates. According to the Office of Naval Intelligence, (lots of information at the link. The China Coast Guard has the largest coast guard fleet in the world) there are at least six of the class. They are almost as large as National Security Cutters (NSC), reportedly 4,000 tons full load, 134 meters (440′) in length, 16 meters (52.5′) of beam, speed 27 knots, range 8,000 miles.

In addition to the 76mm gun, they have a pair of 30mm Gatling guns. It is not clear if they have a fire control system that would make the 30mm guns effective as CIWS, but they could certainly do serious damage to surface targets at close range in a very short time.