Aerobatic Maneuvers : The Russian Air Force has developed tactics for using Flankers to fight stealth fighters that concentrate on taking advantage of the plane’s remarkable maneuverability to survive the first missile attack.
Chinese Stealth Tech- many think China borrowed fighter technology. I also think it would be foolish not to use proven ideas. Plus if your designs can be taken the only main advantages are strategy and training. This where the majors have the edge.