President Volodymyr Zelensky dismissed Ukraine’s ambassador to the United States, Olha Stefanishyna, in a presidential decree published on Monday. Stefanishyna had been in her job for nearly a year. Her departure had been expected for several weeks. Her departure coincides with a shake-up in recent weeks of top officials, including the replacement of the prime minister and defence minister. A reshuffle of Ukraine’s diplomatic and ambassadorial appointments is also expected. Stefanishyna,...