If you can't break through this step, it means you'll always be dependent on imports and will never be able to build a truly advanced system of your own.
If you're certain you can't break through this step, you should change your direction.
No matter how friendly two countries may be, a technologically superior nation will only tell you what to do, but never why.
China-Soviet, China-US, China-Russia... all technology transfers, collaborations, or what you might call "stealing"—they only yield knowledge about "how to do something," never "why to do it."
For example:
Russia can teach Pakistan how to build the RD-93 engine. They'll tell you how to make turbofan blades and nozzles, but they'll never tell you, "Why are the blades designed this way? Why is the nozzle angle this way?"
China can teach Pakistan how to build the JF-17 fighter jet. But by the same token, we won't tell you the reasons behind every detail of its design parameters.
Trying to master this knowledge requires constantly experimenting with certain data points to explore the effects of these changes. However, for fighter jets, this approach is extremely risky.
China's early imitations of Soviet-era fighter jets didn't have a high crash rate. Starting in the 1990s, China began experimenting with this technology. Early models like the J-10, JH-7, and Y-8 all suffered numerous crashes. The military testing phase is not public, but the actual accident rate is very high. To date, the PLAAF's test pilot unit has lost a total of 32 elite pilots...
View attachment 146458
View attachment 146457
No one would dare to trade this knowledge, earned with the blood of heroes, for money.
As for your complaints about China, you need to first understand the basic rules of international politics. I don't want this thread to turn into a verbal battleground.