Naval News reports that the Korea Coast Guard will be receiving two new cutters. These are reported to displace 4,200 tons full load, meaning they are slightly smaller, but considerably longer than the 418 foot 4500 ton National Security Cutters and 360 foot Offshore Patrol Cutters of similar displacement.
There is no indication of the speed of the new cutters, but the earlier similar sized cutters, hull numbers 3009, 3010, and 3011 were reportedly capable of 28 knots. Armament seems be being standardized at a twin 40mm mount and 20mm Sea Vulcan Gatling Guns, both locally produced.
The Korean Coast Guard currently has 36 cutters of more than 1500 tons full load, including two of 6,500 tons full load, only one of the 36 is over 26 years old. Their Exclusive Economic Zone is less than 2.7% that of the US, but it is complicated by the proximity of North Korea, China, Russia, and Japan.