Who did the QRA prioritize trying to intercept?
Fighter units of the Japan Air Self-Defense Force:  One of their main activities is providing Quick Reaction Alert intercepts to Chinese and Russian aircraft nearing or violating Japanese airspace. Quick Reaction Alert: Quick Reaction Alert, known colloquially as QRA, is state of readiness and "modus operandi" of air defence maintained at all hours of the day by NATO, mainly involving the Royal Air Force (RAF).
Chinese and Russian aircraft