One interesting tactic that the US will apparently use as well is to use Gen 4 fighters as “missile trucks” operating well behind Gen 5 F-22s and F-35s. The forward deployed stealth aircraft will designate targets within visual range, and the F-15s and F-16s in many miles away will fire AMRAAMs to destroy the aircraft.
It’s a pretty good approach and nicely addresses the limited munitions the Gen 5 aircraft can carry internally.
“At the end of fiscal 2017, the ASDF is to deploy fifth-generation F-35 stealth fighters that are hard to detect by radar ...”
That’s the same year that China’s fifth-generation J-20 stealth fighter becomes operational and two years later becomes combat ready.