Top Story with Tom Llamas - Feb. 28 | NBC News NOW

Ukraine’s largest cities are under a barrage of rockets as Russia is being accused of using banned cluster bombs on civilians with children among the dead, more than half a million Ukrainians have already fled the country to neighboring countries with millions more expected to follow, new data shows the Pfizer Covid-19 vaccine is far less effective in preventing infection in kids ages 5-11 and Major League Baseball fails to end a player lockout on deadline day as Opening Day approaches.

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