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brought down a presidency 50 years ago today. >> announcer: this is "nbc nightly news" with lester holt. good evening the fate of two missing american military veterans, volunteers in ukraines fight against russia, may be coming into focus tonight. video said to show alexander drueke and andy huynh, appearin on russian television this evening the men apparently captured by russian troops we are showing still frames of the video that appears to show both men alive a third american rem...