cbs evening news coming up captioning sponsored by cbs o donnell: tonight, the u.s. puts more than 8,000 troops on heightened alert for possible deployment to eastern europe, as tensions with russia intensify. president biden meets with our european allies as the u.s. and n.a.t.o. send military might into the region, in hopes of stopping vladimir putin from entering ukraine. a wild day on wall street the stunning comeback after the dow dropped 1,000 points. the school mask debate school boards sue virginia s new governor over his mask optional order. but in los angeles, students are told to upgrade their masks. tonight, parents react. breaking news three firefighters killed in baltimore after a row home collapses and