An adviser to President Volodymyr Zelensky resigned after suggesting Ukrainian air defense systems may have been responsible for the deadly damage in Dnipro to an apartment building, which was mostly destroyed Saturday as Russian missiles rained down across Ukraine. The adviser, Oleksiy Arestovych, later distanced himself from the suggestion, but it was used by the Kremlin to cast doubt on who was to blame. Arestovych apologized on Ukrainian television and said in a letter announcing his resignation that he had made a “fundamental error.”