collapse as ukrainian troops fight back. president zelenskyy says, quote, every lost life is an argument for ukrainians and other free nations to perceive russia exclusively as a threat generation after generation. we ll bring you the latest updates we re getting on the ground ahead. also, right now, to mask or not to mask. that s a big question millions of americans are asking. in a jolt to how we travel, a judge struck down the biden administration s mask mandate for planes, trains, and public transportation. it opens up a major new phase of the pandemic as we watch cases rise around the country. but for many people, on a plane learning they can t they can finally demask, this reaction. [ cheering ] and here s what folks told nbc s miguel almaguer on one of the first flights after masks became optional.