Now some reports from China are fueling speculation about the advanced capabilities of their newly unveiled J-36 fighter jet.

However, this engine has become infamous for its unreliability, which is why China's successful test of a J-20 powered by a pair of WS-15 engines is viewed as a significant milestone. Previous ...

but production models appear to still rely on Russian Saturn AL-31 engines. The Chinese-produced WS-15 is slated to enter service within a few years, but until then, the J-20 will be at a thrust ...