via Korea Times...
Korea Aerospace Industries (KAI) started the project in March with a plan to secure technological assistance from the U.S. defense giant. When the DAPA signed a 7.3 trillion won deal with Lockheed in September last year to purchase 40 F-35s, it said Korea would receive a total of 25 F-35 related technologies under the offset program.Here.
In less than a year, however, the KF-X program encountered difficulties as the four ― the active electronically scanned array (AESA) radar, infrared search and track (IRST), electronic optics targeting pod (EOTGP) and RF jammer ― are at the heart of the jet development.
"It depends on the performance of the radar, but developing an AESA radar will take 20 to 30 years if you currently have no technology about it," said a military official asking not to be named.
I thought that Korea was on par with the US and Europe. The reality seems different........They're behind even the Japanese.
Image over reality I guess. The KF-X is for all intents and purposes already dead which will leave the Japanese as the only other nation building a stealth airplane outside of the F-35 partners.