i m poppy harlow. and i m jim scuitto, live from the united nations, where minutes from now president biden will deliver his global address. hanging over this assembly are new and alarming threa from russia. a major public escalation in the war in ukraine, as world leaders meet here at the u.n. this is a harrowing time for ukraine, for europe and the wo world. president putin announced he s calling up 300,000 reservists. he also said he s not bluffing. let s begin on the ground in ukraine. nick paton walsh is in the eastern ukraine. this is not the first time the russian president has threatened nuclear weapons. ukraine would be the center of this, what s the reaction. reporter: there always have deep concerns, but also a reality is setting in, possibly a leader in defeat and possibly using rhetoric where he doesn t have capacity, but it doesn t reduce the fear this was essentially response there have been none, but also key one of the words he said was using the
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