Ukrainian President Volodymyr Zelensky on Friday removed his powerful chief of staff and top negotiator, Andriy Yermak, after detectives raided his house as part of a sweeping corruption probe.

Yermak's removal deals a serious blow to Zelensky, who is facing a mounting Russian offensive in the east just as the United States, a crucial ally, tabled a surprise plan to end the war that heavily favoured Moscow.

Just last week, Zelensky had named Yermak, 54, as Ukraine's top negotiator in high-stakes talks to refine the US plan. That was a vote of confidence amid growing pressure from opposition figures to remove his divisive chief of staff.

Then on Friday Zelensky announced in a video address: "The Office of the President of Ukraine will be reorganised. The head of the office, Andriy Yermak

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