Well according to the "conspiracy theorists" China, US and Russia are in a secret cold war in reverse engineering crashed UFOs. Thats where China is getting all this revolutionary energy tech. The US too. A huge amount of breakthrough tech came out of one US company, Bell labs. China is possibly winning the reverse engineering in one area (energy), while the US maybe has the lead in propulsion, sensors and Russia radars etc. Each country is successful in one area but failing in others. They are reluctant to share breakthroughs and tech with each other as such breakthroughs will lead to huge military superiority and dominance over the others. Since China has an authoritarian model and control over all Chinese companies the CCP has huge advantages compared to the US capitalistic model. The US ends up reverse engineering in silos and giving the UFOs to weapons/aerospace companies (Lockheed,Radiance Technologies) in order to keep everything secret as US Gov has reportedly done studies that show it would be more negative than positive to disclose to humanity about these so called crashed UFOs. But some stuff has came out recently in congress from whistleblowers and some congress members who were briefed on in. Who knows if true or not but all very interesting stuff!