When the US and EU certification authorities certify this plane then maybe the big two should be concerned, but not yet. One would have expected the that former Soviet Union/Russian Federation to have developed a competitive commercial airliner industry but never did, and one has to question if China can really do it, but then again the West gave China the tools that they never offered to the Russians. However, as commented above, the Chinese have bought or stolen the technology systems they needed to get where they are, and one can certainly bet that their military are using the same stolen/bought/reverse engineered components as are going into this commercial jet. We are such fools, and who can blame the Chinese for taking advantage of us.