As of December 2020, the only combat-ready stealth aircraft in service are the Northrop Grumman B-2 Spirit, the Lockheed Martin F-22 Raptor, the Lockheed Martin F-35 Lightning II, the Chengdu J-20, and the Sukhoi Su-57, with a number of other countries developing their own designs. The United States is the worlds leading operator of stealth aircraft, with approximately 600+ F-35 Lightning II and 150-186 F-22 Raptor. Other countries with operational stealth fighters include Norway, Israel, and South Korea. Russia and China also have their own stealth fighters, the Sukhoi Su-57 and the Chengdu J-20, respectively. However, according to a Forbes article, Russias stealth fleet ranks 11th in the world. It is believed that the U.S. and Israel are the only countries that have used stealth aircraft in combat.