"This is an exercise that would be absolutely impressive to anybody who's watching," US Ambassador to Germany Amy Gutmann told a news conference in Berlin.
"I would be pretty surprised if any world leader was taking note of what this shows in terms of the spirit of this alliance, which means the strength of this alliance, and that includes Mr. (Vladimir) Putin," she said.
More than 100 aircraft and 2,000 military personnel have been sent from the US to Europe for the exercise, Gutmann said.
"Air Defender 2023 is the largest deployment exercise of allied air power in Europe, in NATO's history. It will demonstrate beyond a shadow of a doubt the agility and the swiftness of our allied force in NATO as a first responder," she said.
Around 10,000 military personnel from 25 NATO nations will take part in the military exercise, and practice defensive maneuvers in the German and European air space.
Source: Anadolu Agency