Illustration: Lau Ka-kuenUS and China both face tough struggles as war for chip supremacy intensifies following American export restrictions- Washington imposes sweeping new rules targeting China but faces major challenges in bid to regain to regain its global primacy in semiconductor manufacturing- Asian rivals far outpace the US in making the advanced chips crucial for fighter jets, drones and cutting-edge military hardwareIllustration: Lau Ka-kuen"