More than 6,500 troops will participate in the month-long exercise.
The former president suggested he would not defend NATO countries if they are attacked by Russia in the future.
The U.S. has been unable to send any new weapons packages to Ukraine as aid legislation stalls in Congress.
By Tara Copp, AP
Dubbed "Steadfast Defender 24," the drill come as Russia’s war on Ukraine bogs down.
By The Associated Press
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