Ukraine's President Volodymyr Zelenskyy has delivered a defiant message to Moscow. saying his country "will not back down until there is a just and lasting peace." Zelenskyy made the comment in an address to the nation as Ukraine celebrates its independence day.  Ukraine has been marking 35 years since it broke free of Soviet rule, with a number of European leaders pledging more support for Kyiv's defense against the full-scale invasion Russia launched four-and-a-half years ago.