ADAZI MILITARY BASE, Latvia—NATO troops from 14 nations amassed last month in a wooded area here to take part in the alliance’s biggest military exercise since the Cold War. Once again, the focus was Russia.

       The drill began in the early morning darkness with a warning: Enemy forces had crossed Latvia’s border with Russia and were closing on the capital. Communicating in various languages over different kinds of radios, the troops raced to push the mock invaders toward wetlands that would bog down their tanks.

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