According to Russian military observation website, China is producing J-20 faster than US F-35B and F-35C to ensure China’s air superiority in long- and super long-range air battles.
A regiment of 30 J-20s is enough to quickly and effectively intercept US early warning and manned and unmanned reconnaissance aircrafts, turning US military blind in areas near China.
With the production capacity of making 36 J-20s a year, China will have a regiment of J-20s by mid 2018.
In addition, 2 J-20 regiment (60 planes) plus dozens of DF-21D are enough to drive away US and Japanese navies. The US may develop better missiles to intercept DF-21D and even DF-26 as US AN/SPY-1A/D multi-function radar can detect the ballistic missiles. However US radar cannot detect a fleet of 10 J-20s conducting stealth attack at US navy with their radars turned off. The 20 YJ-91 supersonic anti-ship missiles carried by those J-20s are enough to sink a US aircraft carrier.
China is now developing hypersonic microwave electromagnetic warheads and stealth warheads even more difficult to intercept. China will have 500 J-20s by 2026, which will enable it to have advantages over others’ navy in the Indian and Pacific Oceans.
Source: mil.huanqiu.com “Russian media: US aircraft carrier battle group doomed facing fleet of J-20s” (summary by Chan Kai Yee based on the report in Chinese)