Really useless as F-22P with some stealth modification is better than that. I am talking about the new Type-54 ie:Bs. I am sure that PN might be looking towards it or may be a something else. Although JV in SSKs and SSBNs are now confirmed with China.
REPEAT: THERE CURRENTLY IS NO SUCH THING AS A TYPE-54B (neither afloat nor known as design: there is only fan-art)
The new ROKN frigates are to have the following subsystems:
■Indigenous 3D radar similar to the SMART-S Mk2;
■Two Ceros 200 multisensor directors;
■Indigenous sonar (hull sonar + towed array);
■Eight SSM-700K surface-to-surface missiles;
■One Rolling Airframe Missile launcher;
■One 127mm gun;
■One 30mm Goalkeeper Close-in Weapon System;
■Korean lightweight torpedoes.
Preliminary designs indicated the new frigates would be around 335 feet in length with a cruising speed of 18 knots. The FFX, with a full load displacement of 3,200 tons, will carry a Lynx anti-submarine helicopter. It will have a crew of 170 and sail at a top speed of 32 knots. Its operational range is 4,500 nautical miles. The ship will have conventional diesel/gasoline propulsion.
In the future, a naval version of K-MSAM (40km range) missile system along with the K-ASROC SUM may be offered in the VLS upgrade.
I very much doubt F22P (which already has some stealth mod elative to Type 53H3 from which it derives) is better than ROKN FFX esp in terms of ability to DETECT and TARGET its weapons. Weapons are comparable, as is tonnage. Additional differences may be expected in: built quality, signature reduction (specifically radiated noise), damage control.
The FFX is of course not the ONLY ship being designed and built by South Korea. See e.g. the 5000 ton VLU equipped KD2 destroyer.