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PBS News Hour
How Poland has become 'the frontline of the NATO alliance'
President Biden's visit to Poland Friday spotlights that country's importance to the military and humanitarian effort in Ukraine. Since the start of the invasion of Ukraine no nation has become more important to western efforts to repel Russia. Stephen Mull, former U.S. ambassador to Poland and now the vice provost for global affairs at the University of Virginia, joins Nick Schifrin to discuss.
