mary bruce standing by with new reporting. hi az dress to the nation tomorrow night. the pandemic and masks now coming off. what new york's governor announced just today. and tonight here, the new study, how effective is the pfizer vaccine for children 5 to 11? and the alarming new report out tonight on climate change. warning of species going extinct, food shortages, regions uninhabitable. if there isn't a significant change in course right now. and tonight here, the boy and the piano. and the unforgettable image. good evening and it's great to start another week with all of you at home. and we begin tonight with russia's invasion of ukraine. five days in, u.s. authorities tonight believe that vladimir putin was not expecting the resistance he is seeing from the ukrainians. nor was he expecting the u.s. and the west, that nato would put up a united front quite like