China has already shown all the crucial technologies needed to build a B-2 style bomber by unveiling the J-20, J-31, Sharp Sword, and Y-20. The engines won't be a problem. The B-2's F118 engines are nothing more than a non-afterburning derivative of the F110 used to power the F-16. The H-20 is already rumored to be under development and will be powered by a non-afterburning variant of the WS-10. China has a 80,000 metric ton forging press for the major structural components of large aircraft. China has the world's fastest supercomputer. So why do we need Russia?