KLAIPEDA, Lithuania—Germany’s top military officer, Gen. Carsten Breuer, stood astride a map of Lithuania laid out on the floor of a makeshift command post in this port city on the Baltic Sea. A chill rain beat against the windows as Breuer and his aides reviewed plans to surge ammunition and fuel to an armored brigade positioned in the likely path of any Russian ground attack on NATO. “We need to train where and how we will fight,” Breuer told the camouflage-clad soldiers gathered around him. “We need to be agile. We need a new mindset.” Breuer is racing to prepare…

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