BY ANDREW E. KRAMER

New York Times

KYIV, Ukraine — President Volodymyr Zelenskyy's dismissal of his longtime right-hand man opens a window for a political overhaul that has been long deferred by the war in Ukraine. But it also injects uncertainty into Zelenskyy's government, leaving him without his key political enforcer as Ukraine is under pressure on the battlefield and at the negotiating table.

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