Concur with the above. Both countries probably played with the numbers a bit to get a higher kill ratio but if you compare our actual losses to their claims, only three of their pilots are aces. I say only 3 as that's more pilot aces than we "officially" had. That article does list in () the number that supposedly matchs our records but it doesn't match some of the other stuff (maybe more accurate) out there. Their three aces were all Mig-21 pilots; number one guy is Nguyen Van Coc, claims 9 but only 6 match our records. The next two are Nguyen Tien Sam with 5 and Nguyen Duc Soat with 5. Coc claims 9, Sam claims 5 and Soat 6. This is according to the latest I've seen from two lists, one in the Osprey series...which isn't always exact either but I think the best thus far. If accurate, then of the 20 claimed, 16 match our records. From what I've seen of Nguyen Van Bay, it looks like he took part in 4 kills that match our records but his flight is listed, so not sure who actually made the victory. I think he was the shooter and victor of at least two of the four. Van Coc was shot down on 2 Jan 67 during Operation Bolo but survived and shot down all of his opponets in 67-68. Sam and Soat shot down all of their oppenents in '72. Sam was shot down on 9 Dec 72 by LtCol Beckers/1st LT Griffin flying an F-4E with a combo of an AIM-9/20mm. He survived as well.
As for the Korean War, even the Osprey series is bunk, no pun intended. It's known that the total loss of Sabre's, for all cause in the war is around 210 or so. That's mishap, AAA, losses to Migs. The Russians simple did not shot down 600+ Sabre's. They admit something like 320 losses against Sabre's. I've read that the Chinese lost about 200 or so to Sabre's and the Koreans 60 or so. That's what they admitted of course. That puts the number close to 600 Migs shot down for about 110 Sabre losses....I think that's around the number we've admitted. That's a 5 to 6:1 kill ratio. Entirely believable, even with the honcho Russians.
