"We realized there was another actor [South Korea] that was also going against them [North Korea] and having great success because of a 0 day they wrote. We got the 0 day out of passive and were able to re-purpose it. Big win."
NSA learned of a 0-day exploit being used by South Korea (not five eyes) and re-purposed it. They had knowledge of an exploit in the wild. Did they share this with anyone in order to close this security flaw? They exploited it. This is not a case of the NSA developing an exploit in house. They took this from the wild. This would seem to confirm suspicions that NSA is/was willing to allow active 0-days to fester, leaving the general public exposed.