Russia and Ukraine will restart face-to-face peace negotiations on Monday, against a background of warnings that the situation in the besieged city of Mariupol is now "catastrophic". Ukrainian President Volodymyr Zelensky has said he is willing to compromise on several sensitive topics.
The two sides have not negotiated directly for weeks, but will hold three days of talks in Istanbul from Monday, according to David Arakhamia, a Ukrainian negotiator.
