In other words, what have been designed by Soviet Union is a product of all the Republics. Thus, Russia does not have the capabilities to develop Soviet's aircraft and engines outside of the Soviet Union, which proves my point.
It does not matter. Today, Russia does not have the ability to design an equivalent of An-125 or An-225. In other words, possessing something and capable of designing that same thing are two completely different concepts. I rest my case.
Whether or not the PAKFA is a new design does not alter the fact that the configuration is based on the configuration of Su-27, the latter being the work of the Soviet Union. We can see this because of the common features found on both Su-27 and PAKFA.
This is entirely irrelevant, as it doesn't reflect Russian's ability to design the same Soviet products. Possession of intellectual properties does not equate to capability of creating similar intellectual properties.
The 117 uses technologies from AL-31 and AL-41, both of the latter engines are product of the Soviet Union. In other words, Soviet Union did much of the work, whereas Russia integrated the two together. This is a completely different concept from creating an entirely new fighter aircraft engine as the American has done with the F119 or as the Chinese are doing with the WS-15.
The PAKFA uses external engine nacelles, straight air intakes, and variable-geometry inlets. These are the same features found on the Su-27. On top of that, the PAKFA also have stabilators extending pass the engine nozzles like the Su-27 does, while the sting extends further than the stabilators. These suggest the designers started with what they know -- the Su-27, a 4-th generation fighter which is a Soviet design, rather than starting from a brand new configuration liked the F-22.
Furthermore, while the PAKFA incoporates some stealth design, it is not a true 5-th generation fighter. The reason is the engine fan is completely exposed, resulting in strong radar reflection. Thus, the aircraft is not stealthy. The panel joints are not serrated, unlike F-22, F-35 or J-20.
As for the 117, the engine is based on technologies from AL-31 and AL-41 that are Soviet technologies. While it is true that Russia did a lot of work in integrating the best of the two engines, it is also true that much of the work was already done by the Soviet Union and that Russia did not design the 117 from a blank sheet of paper. Thus, what the Russia did with the 117 cannot be compared to what the Americans did with the F-119, nor be compared to what the Chinese are doing with the WS-15.
