Russia's full-scale invasion of Ukraine and President Trump's efforts to change the U.S. relationship with Europe and NATO have caused some European countries to rethink their own defense. One example is Poland, which shares a 500-mile border with Russia and Russian ally Belarus. Poland is preparing to repel a Russian invasion, and this preparation includes a plan to train every adult male in the country to be ready for war. We go to Poland to see what the preparations look like.

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