That's why everytime They try to Enter in Japanese water, Japanese Subs force them to return.
They tried to get the tech of Reducing sub acoustic signature from Russian Scientists & Russia punished those scientists with Treason & Gave them Life sentence of 70-80 Year.
Everyone knows except Pakistanis that Chinese subs are famous for their Noise & acoustic signatures.
And chenes are still not able to develop any credible defence systems for their ships which can protect them from Railguns, Harpoon & Brahmos Naval.
that's why they use 5 to 4 layers of defenses unlike the whole world which uses maximum 3 layer of defenses.
WS -13 & 15 are famous for eating themselves like intial Mig-25 & Mig-21 engines.
Fir trainers China use Ivenchenko Progress or 50 yrs old Garret engines, Which HAL builds for Americans.
For J-10s they use Al-31F & most of their Crashes happen bcoz of Engine burns.
Just Imagine U have an Engine of 110KN thrust & instead of mass producing it U r begging to Russia for AL-41F.
Putin refused to sell only Engines that's why they bought SU-35.
In last 12yrs they barely produced 300 WS-13 & 5-6 WS-15.
It's their own DATA now imagine the reality.
And FYI J10 uses AL-31F of Su-30
Why don't ask ur own Airforce why they refused to use modern WS-13, Instead of that they want 20 Years old RD-93MA Kilmov (which have service life of just 2200 hours)of Russia for JF-17 Block 3.
You guys trust Chinese tech more than the Chinese themselves.
They are so good at building Engines that their Z-10 underpowered where HAL has already complicated a Project of 1500HP Helicopter Engine. Which will be used for HAL multirole Helicopter project.
