 The United States unveils B-21 Raider stealth bomber. America's newest long-range stealth bomber B-21 was unveiled on Friday. The B-21 Raider is a 6th generation stealth fighter, which will be able to deliver both conventional and nuclear weapons around the world, using long-range and mid-air refueling capabilities. Developed by North Group Grammar Corporation, B-21 is the first new American bomber aircraft in over 30 years and is expected to replace B-1 and B-2 bombers. The U.S. Air Force will buy at least 100 of the planes that are projected to cost around $550 million dollars each. The U.S. defense secretary, Lord Austin, has described B-21 as impressive, dressing that no other long-range bomber can match its efficiency. Even the most sophisticated air defense systems will struggle to detect the B-21 in the sky. Austin said it's an unveiling of the bomber. The release of the new stealth bomber comes amid arms race with China as well as high-altitude tension with Beijing and Moscow. Earlier Pentagon released a report which says that China has doubled the number of nuclear warheads and could have around 1500 nuclear warheads by 2035.