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Are quite effective against the t-80 tanks which the russians are employing in these efforts against ukraine right now. >> reporter: the u.s. has been warning allies of a possible russian invasion with just a short window to prevent russia from taking action as top u.s. officials increasingly sound the alarm publicly. >> we have concerns about russias unusual military activity on the border with ukraine. >> were not sure exactly what mr. putin is up to. >> reporter: a top intelligence official c...