Pakistan's airforce works closely with Chengdu Aerospace Corporation - the JF-17 Thunder [0] being their flagship product. That said, even Chinese flagship aerospace manufacturers also depend on IP transfers from Russian firms like Klimov and UEC Saturn. Also, most companies require some amount of IP transfer and collaboration because of how complex Engine design, Body design, etc are, as well as the fact that collaboration incentivizes collaborating countries to purchase these weapon systems. Aerospace, cybersecurity, enterprise partnerships, weapons systems - it's all the same business model.