KYIV – A massive Russian drone-and-missile attack targeted Ukraine for a second consecutive night, killing at least seven people and injuring dozens, officials said early Sunday.

The attack took place on the third day of a planned prisoner swap between Russia and Ukraine, the only tangible outcome from peace talks in Istanbul earlier this month which have so far failed to produce a ceasefire. The exchange has been a rare moment of cooperation between the warring sides.

Kyiv Mayor Vitali Klitschko said “there are already 10 injured in the capital” as of 3 a.m. Sunday. Soon afterward, Ukraine’s emergency service said four people were killed and 16 were injured, including 3 children, just in the Kyiv region.

Klitschko said a student dormitory in Holosiivskyi district was hit by a drone and one of the building’s walls was on fire. In Dniprovskyi district, a private house was destroyed and in Shevchenkivskyi district, windows in a residential building were smashed.

Ukraine’s President Volodymyr Zelenskyy and Russia’s defense ministry said each side brought home 307 more soldiers on Saturday, a day after each released a total of 390 combatants and civilians. Further releases expected over the weekend are set to make the swap the largest in more than three years of war.

“We expect more to come tomorrow,” Zelenskyy said on his official Telegram channel. Russia’s defense ministry also said it expected the exchange to be continued, though it did not give details.

Hours earlier, explosions and anti-aircraft fire were heard throughout Kyiv as many sought shelter in subway stations as Russian drones and missiles targeted the Ukrainian capital overnight.

In talks held in Istanbul earlier this month — the first time the two sides met face to face for peace talks since Russia’s 2022 full-scale invasion — Kyiv and Moscow agreed to swap 1,000 prisoners of war and civilian detainees each.