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In ukraine, even as they try to buy time by muscling open the window for diplomacy. new reporting tonight shows that window may be slamming shut fast, with nbc news learning u.s. intelligence shows russian military officials have been given the green light to invade, according to top sources. and president biden today in the situation room for an emergency meeting. we have every angle covered this sunday night, starting with our erin mclaughlin in kyiv. >> reporter: tonight, a barrage of artille...