Head of the Office of the President of Ukraine Andriy Yermak (left) attends a meeting alongside Ukraine's President Volodymyr Zelensky (right) in Warsaw, Poland on January 15. Sergei Gapon/AFP/Getty Images

Since before the start of Russia’s full-scale invasion, he was rarely far from Volodymyr Zelensky’s side, whether welcoming foreign dignitaries to Kyiv, or accompanying the Ukrainian president abroad on crucial missions to secure military and diplomatic support.

Now, Andriy Yermak’s resignation could become Zelensky’s biggest political test since taking office six-and-a-half years ago. While the departure will likely play well at home, it casts uncertainty into the heart of the administration at a critical diplomatic moment.

Yermak, the former head of the president’s office, quit

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