Olha Stefanishyna, former Ukrainian Ambassador to the United States, attends a hearing at the High Anti-Corruption Court of Ukraine in Kyiv, Ukraine, on Aug. 5, 2026. (Ivan Antypenko / Suspilne Ukraine / Global Images Ukraine / Getty Images)Olha Stefanishyna, Ukraine's former ambassador to the U.S. and deputy prime minister for European integration, was widely regarded as an effective manager. "The main issue is the Zelensky team's reluctance to bring in people from outside his inner circle," Yurchyshyn told the Kyiv Independent. Later, Stefanishyna served as deputy prime minister for European integration from 2020 to 2025 and as justice minister from 2024 to 2025. If a prime minister resigns, the entire cabinet is ousted.