Russia and Ukraine have exchanged hundreds more prisoners as part of a major swap that amounted to a moment of cooperation in otherwise failed efforts to reach a ceasefire.

The meeting between a delegation from Kyiv and Moscow capped off a week of diplomacy that saw world leaders descend on Turkey for a series of talks in Ankara, Antalya and finally Istanbul. It was there that officials from Russia and Ukraine met face-to-face today for the first time in three years.