Gen. James Hecker, the head of U.S. Air Forces in Europe, told reporters Sept. 19 that Russia has lost more than 60 fighter jets in the war so far.
NATO has nearly doubled the usual number of military jets on alert across Europe.
"NATO is not to be part of the conflict,” Secretary General Jens Stoltenberg said Tuesday.
Russian fighters buzzing U.S. Navy recon planes in Eastern Europe could lead to disaster, analysts warn.
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