Russia says it has handed over the remains of 1,000 soldiers to Ukraine and has received the bodies of 35 Russian soldiers in return.
It comes as Ukraine's chief negotiator met US President Donald Trump's envoys in Geneva to discuss economic plans for the reconstruction of Ukraine after the war.
Negotiators were also preparing a third round of US-led talks aimed at ending the conflict which has entered its fifth year - a trilateral meeting involving the Russian side, too.
Hours before the Geneva talks, Russia launched 420 drones and 39 missiles in six different regions of Ukraine, injuring dozens of people, Ukraine's President Volodymyr Zelensky said.
