Russia and Ukraine exchanged prisoners again for the first time in months on Friday, but any hopes of de-escalation in the war were dashed by early morning attacks from both sides.
Ukraine President Volodymyr Zelensky was meanwhile in Stockholm to sign security agreements with Sweden, Iceland and Norway as the West kept up its support for the country invaded by Moscow back in February 2022.
The meeting came as the German government said it had authorized Ukraine to use German-supplied weapons against military targets in Russia.
Seventy-five Russian soldiers "who were in mortal danger" have been sent back by Ukraine, the Defence Ministry in Moscow said.
In return, 75 prisoners of war were handed over to the Ukrainian armed forces, Zelensky confirmed.
Both sides also exchanged the bodies of dead soldiers. Ukraine received 212 remains back and the Russian side received 45 bodies.
The last major prisoner exchange between the two sides took place in February. Just two days ago, Russian Human Rights Commissioner Tatyana Moskalkova accused the Ukrainian side of sabotaging the exchange, saying that Kiev was "constantly making new demands."
Ukraine attack on Russian oil terminal
Kiev has also been trying to counter-attack against Moscow for months, and a night-time Ukrainian drone attack led to a fire breaking out in an oil terminal at the Russian Black Sea port of Port Kavkaz, the local governor said.
"Three cisterns with oil products were damaged and are on fire," the governor of the Krasnodar region, Veniamin Kondratyev, announced on his Telegram channel. Two employees of the oil terminal were slightly injured, he added.
The flames could be seen on the nearby Crimean peninsula, which Russia annexed in 2014 in violation of international law.
Ukraine has been increasingly attacking oil refineries and transport infrastructure in Russia, in addition to purely military targets.
At least five killed in Kharkiv
But Russia continued its bombardment of Ukraine's second city of Kharkiv. At least five people have been killed and more than two dozen injured in Russian missile attacks in the north-eastern city, Governor Oleh Syniehubov said on Telegram on Friday.
Most of the victims lived in a five-storey apartment block. The attacks also damaged a fire engine and an ambulance, he said.
At least 20 residential buildings were damaged as a result of the attack involving five missiles.
The capital Kiev was also hit with at least one cruise missile, the authorities said, adding that a car repair shop, a car wash and half a dozen vehicles were damaged by falling rocket debris.
A transformer station was damaged, the energy company DTEK said, but the power supply has already been restored. There were no casualties.
Zelensky signs security deals in Stockholm
With no end it sight to the war, Zelensky flew to Stockholm for the third Ukraine-Northern Europe Summit where the pacts with Iceland, Norway and Sweden were signed.
"Only together can we stop the madness from Moscow," he said.
The agreements are initially valid for 10 years. Ukraine has already signed similar security deals with Denmark and Finland.
Swedish Prime Minister Ulf Kristersson said: "The agreement is a powerful signal to Russia that it is basically pointless to continue the war with the assumption that Western countries will tire."
Kristersson described supporting Ukraine in its fight against Russia as a "fundamental, existential task" for the countries of Northern Europe, whose security is also threatened by Russia's actions.
