close Former EUCOM official blasts Spain as Eastern Europe steps up FDD's Rear Admiral (Ret.) Mark Montgomery says frontline NATO states are increasing defense spending and military capabilities while some Western European allies continue to rely heavily on U.S. security guarantees. NEW You can now listen to Fox News articles! This is part six of a series examining the challenges confronting the NATO alliance . As President Donald Trump presses NATO allies to shoulder more of Europe's defense

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