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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 pres...

Yourself and your team safe. to discuss all of this, david sanger, white house national security correspondent for "new york times." david, always good to have you here. you and i have been covering ukraine for years. i wonder, based on the officials you speak with, should they take this threat more seriously? >> i think they have to take it more serious ly nork month is te 60th anniversary of the cuban missile crisis. i think it's face to say what we face is second only to we have a leader threatening nuclear weapons, and he did this before