The Office of the President of Ukraine announced on the 21st the dismissal of Ambassador Pristaiko to the United Kingdom. The reason for his dismissal has not been disclosed, but British media have reported that the background was that Mr. Pristeyko criticized President Zelensky over his handling of military assistance from various countries.

Regarding military assistance to Ukraine, British Defense Minister Wallace said that Ukraine should express more gratitude to other countries, and President Zelensky responded at a press conference on May 12, saying, "How can I thank you more?

On the 13th, Ambassador Pristeico criticized the president's remarks on the British TV station Sky News, saying, "This kind of irony is unhealthy, and there is no need to show Russia that there is something in our relationship."

Some British media outlets believe this led to his dismissal.

Pristaiko has served as the British Ambassador since 2020 after serving as Foreign Minister and Deputy Prime Minister of Ukraine.

Some British media have pointed out the impact of his dismissal, saying that he has played a major role in securing military support from the United Kingdom on a scale second only to the United States.