But if Russia has it, it will force the US to develope the more advanced fighter jets. This is a good way to drag the offensive opponent into a unbalanced warfare building battle and exhaust such opponent's resources. Now O8 is planning to cut a lot defense projects due to the huge budget deficits. The dilemma they will face is either cutting expenses and waiting and seeing Russia and China to catch up gruadually and changing its offensive strategy and withdraw from worldwide multi-fronts or continuing to spend way more money than Russia and China to keep its lead and seeing its economy falling into a bigger hole.