The warring sides also exchanged prisoners in one of the few results of talks last week, and Russia reported new attacks on the front line.

The attack used almost 500 drones and missiles, breaking a record set just days earlier, as Russia tries to overwhelm Ukraine’s air defenses, which shot down most of the weapons.

Russia launched a barrage of drones and ballistic missiles across broad swaths of Ukraine early Friday, killing at least six people and injuring dozens of others, days after Kyiv launched a daring raid on Moscow’s fleet of strategic bombers.