Russia gains ground in Ukraine after seizing Europe’s largest nuclear plant. It comes as NBC News learns about 92% of amassed Russian military is now inside Ukraine. Meantime, the U.N. confirms at least 1.2 million people have fled the country, worsening the humanitarian crisis. Plus, President Zelenskyy plans to hold a virtual meeting with the U.S. Senate on Saturday. And Secretary of State Antony Blinken reaffirmed the U.S. has no intention of closing the airspace over Ukraine. Eugene Daniels, Gen. Barry McCaffrey, Jeremy Bash, Inna Sovsun, Igor Novikov and Lynsey Addario join.