Ukrainian President Volodymyr Zelenskyy accused Russia of trying to humiliate the United Nations by raining missiles on Kyiv during a visit to the city by the U.N. chief, a deadly attack that shattered weeks of relative calm in the capital.

Ukraine’s forces, meanwhile, fought to hold off Russian attempts to advance in the south and east, Zelenskyy reported. And U.N.-backed efforts to arrange safe passage for residents trapped in the ruins of Mariupol continued. Numerous previous attempts to evacuate civilians have fallen through.

Russia pounded targets all over Ukraine on Thursday, hitting a residential high-rise and another building in Kyiv just as life seemed to be getting a little closer to normal. U.S.-funded broadcaster Radio Free Europe/Radio Liberty said one of its journalists was killed.