Two U.S. F-22 stealth fighter jets squared off in simulated dogfights with two of Norway's expanding fleet of F-35 aircraft on Wednesday as part of an exercise aimed at strengthening the NATO alliance and increasing its deterrent power.

The two U.S. F-22s are among 13 in Europe for a series of short-term deployments in places such as Greece and Poland, with further training missions planned in undisclosed locations in coming days.

The Norwegian deployment lasted just one day but will lay the groundwork for NATO allies as they work to integrate their stealth warfare capabilities, Col. Leslie Hauck, chief of the fift- generation integration division at the U.S. Air Force's headquarters in Europe, told reporters in Norway.