Analysis of information sources in references of the Wikipedia article "Comac C919" in English language version.
The head of EASA, the European Union Aviation Safety Agency, definitively ruled out that the long discussed Chinese aspiration to win European certification of the 919 would come in 2025, said that's not happening, but what they did say was that EASA would end up approving the C919 in three to six years. Look, that's huge. That starts the clock with some degree of certainty of Western validation of the C919.
The human intelligence efforts included one by a now-indicted MSS intelligence officer to recruit an insider at LEAP-X manufacturer General Electric. The same officer also recruited a China-born US Army reservist who was an expert at assessing turbine engine schematics. So far, at least four individuals have been arrested in connection with China's campaign targeting aerospace companies.