China has released video of a flight of seven Chengdu J-20 stealth fighters, the largest formation seen so far, suggesting that the fifth-generation warplane has gone into production as an arms race with the United States mounts in the region. For more info click the link

https://www.scmp.com/news/china/military/article/3025720/pla-air-force-formation-sign-stealth-fighter-mass-production