President Zelenskyy says Ukrainian forces have liberated a key suburb of Kyiv; Pres. Biden clarifies his comment that Putin "cannot remain in power,” saying he stands by his words; The FDA is expected to authorize a second COVID-19 booster shot for Americans over the age of 50; Will Smith apologizes to Chris Rock as the fallout continues after he slapped the comedian on stage at the Oscars following Rock’s joke about Smith’s wife, Jada.