Russia Pummels Ukraine's No. 2 City As Convoy Nears Kyiv

Ukrainian President Volodymyr Zelensky stresses the importance of defending the capital as Russian forces advance into Kharkiv, Ukraine's second largest city. A video from the Ukrainian government shows the aftermath of an attack on a government building, though its authenticity cannot be independently verified. Zelensky states that the attack has changed everything and urges all countries to oppose Russia.

What does the video posted by the Ukrainian government show?

What call did President Zelensky make to the countries of the world?