NATO has launched what it’s calling its "largest deployment exercise" in history, aimed at sending a message to countries like Russia that it "is ready to defend every inch of Allied territory." 

The two-week long "Air Defender" exercise is set to run until June 23 and will involve 25 countries, 10,000 personnel and 250 aircraft, according to NATO. 

"Air Defender is necessary because we live in a more dangerous world," NATO spokesperson Oana Lungescu said in a statement. "As we face the biggest security crisis in a generation, we stand united to keep our countries and our people safe." 

"Air Defender sends a clear message that NATO is ready to defend every inch of Allied territory," she added. 

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The military drills are being hosted by Germany. 

"With 250 aircraft, including around 100 from the United States, Air Defender also demonstrates the strong bond between Europe and North America, working together in NATO," Lungescu said. 

Lt. Gen. Ingo Gerhartz, chief of the German Air Force, told The New York Times that Russia’s annexation of Ukraine’s Crimean Peninsula in 2014 was a "wake-up call" for NATO to organize such drills. 

The U.S. has sent over thousands of service members, mostly from National Guard units, to participate in the exercises, the newspaper adds. 

"It’s pretty much unprecedented, the amount of aircraft and people that we’ve moved over here in such a short period of time," Maj. Will Dyke, a pilot with Kentucky’s Air National Guard, told The New York Times. 

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NATO said "Air Defender" has been planned for several years. 

"Most of the aircraft will be stationed on several German air bases. Training missions will primarily take place over the North Sea, the Baltic Sea and Southern Germany," it said.

"The drills are aimed at boosting interoperability and preparedness to protect against aircraft, drones and missiles attacks on cities and critical infrastructure. Other training events will include supporting ground troops and evacuation missions," NATO added. 

Meanwhile, Ukrainian troops reportedly have retaken seven villages from Russian forces over the last week, according to Deputy Defense Minister Hanna Maliar. 

"The battles are tough, but our movement is there, and that is very important," Ukrainian President Volodymyr Zelenskyy said in a recent nightly video address, according to The Associated Press.