Grainy satellite images of what is believed to be a new Chinese fighter jet caused a stir . Known as the Falcon , stealth fighter is n't supposed to be operational until at least 2017 . A Pentagon spokesman says the United States is aware of situation , but it is n't fretful about it . It needs to be made competitive with this fighter . '' A military scholar says the development is a threat to U.S. military superiority in the region .
Grainy satellite images of what is believed to be a new Chinese fighter jet caused a stir . Known as the Falcon , stealth fighter is n't supposed to be operational until at least 2017 . A Pentagon spokesman says the United States is aware of situation , but it is n't fretful about it . A military scholar says the development is a threat to U.S. military superiority in the region .