Issues around the surrender of land and security guarantees in the future remain unresolved.
Volodymyr Zelenksyy is warning that surrendering the Donbas region to Russia would be "the worst way" to resolve peace negotiations.
It's one of the central issues in peace talks and negotiations on the future of the area.
It's on the eastern front of the war - and was one of the points from which Russia launched its invasion in 2022.
Defence and security analyst, Mullingar's Declan Power says talks will also need to answer the question of what will happen after the conflict ends:
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