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.

Ukraine’s capital Kyiv came under a large-scale Russian drone and missile attack overnight into Saturday, just hours after Russia and Ukraine began a major prisoner exchange.

Ukraine has secured the release of 307 Ukrainians from Russian captivity in the second phase of its largest prisoner exchange with Russia, President Volodymyr Zelensky announced on May 24.