Four people were wounded in a series of Russian attacks Sunday on Ukraine's second-largest city, Kharkiv, according to local authorities. President Volodymyr Zelenskyy said, “It is quite obvious that our existing air defence capabilities in Ukraine are not enough, and it is obvious for all our partners. And the world must finally hear the pain that Russian terrorists are causing to Kharkiv, Kupiansk, to the cities of Donetsk, Zaporizhzhia, and Sumy regions, and to many other Ukrainian communities.”