Russia and Ukraine each exchanged 307 of their service personnel on Saturday on the second day of a prisoner exchange that, when completed, is set to be the largest such swap in the three-year war between the two countries.

Russia and Ukraine began a major prisoner exchange Friday, swapping hundreds of soldiers and civilians in the first phase of an exchange that was a moment of cooperation in otherwise failed efforts to reach a ceasefire in the 3-year-old war.

Turkey’s foreign minister is set to travel to Russia on Monday to discuss the situation in Ukraine, following direct talks earlier this month in Istanbul between the two sides in conflict.

Reuters witnesses saw and heard successive waves of drones flying over Kyiv, and a series of explosions jolted the city.

Moscow launches largest drone and missile attack to date on Kyiv as 14 injured - Overnight strikes follow days of some 800 Ukrainian attacks on targets inside Russia

As Ukrainian drones strike deep into Russian territory, they are disrupting day-to-day life and reminding Russians that the war is not confined to the trenches.

This week's prisoner exchange between Russia and Ukraine was the largest since the war’s onset. But skepticism of a lasting truce, and President Trump’s peace-making, remains. Bridget Brink resigned as ambassador to Ukraine in April,