Nine people were killed in a Russian drone attack on a minibus carrying civilians on Saturday, Ukrainian authorities said, a day after Moscow and Kyiv agreed a large-scale prison exchange at talks in Türkiye.
At the end of a tense week, Ukraine and Russia held their first direct talks in more than three years but failed to agree to a truce.
And despite the threat of new sanctions on Russia from Kyiv's allies, there has been no let-up in fighting.
"Unfortunately, as a result of a cynical attack by the Russians on a bus with civilians, there are dead," the military administration in Ukraine's northern Sumy region said in a Telegram post.
"Unfortunately, the death toll has risen to nine," it added later, alongside a photo of a mangled blue minibus that had apparently been torn apart by the blast.
Four people were wounded in the attack, the administration said.
In the earlier post, the authorities had said that eight people were killed.
The bus, which was attacked near the city of Bilopillya while travelling towards Sumy, was "targeted by the Russians", the military administration said.
Ukraine's Sumy border region has come under increasingly deadly bombardments by Moscow since March when Ukrainian forces were pushed out of Russia's neighboring Kursk region, which they had partially controlled since the summer of 2024.
This latest attack came after three people were killed in Russian strikes on Friday on Ukraine's eastern Donetsk and southeastern Kherson regions.
The first direct talks since the spring of 2022 -- shortly after Moscow's full-scale invasion that February -- between Ukraine and Russia in Istanbul resulted in a concrete agreement to exchange 1,000 prisoners each.
But there were few signs of any progress towards halting the fighting that has dragged on for more than three years, destroyed large swathes of Ukraine and displaced millions of people.
The two sides said they would "present their vision of a possible future ceasefire", according to Russia's top negotiator, Vladimir Medinsky.
Ukraine's top negotiator, Defense Minister Rustem Umerov, said the "next step" would be a meeting between Ukrainian President Volodymyr Zelenskyy and Russia's Vladimir Putin. Russia said it took note of the request.
Putin had declined to travel to Türkiye for the meeting, with Zelenskyy accusing him of being "afraid" and Russia of not taking the talks "seriously".
Zelensky attended a European summit in Albania alongside the leaders of France, Germany, Britain and Poland, among others, where he urged a "strong reaction" from the world if the Istanbul talks failed, including new sanctions.
French President Emmanuel Macron said European nations were coordinating with the United States on additional sanctions against Russia should Moscow continue to refuse an "unconditional ceasefire".
Both Moscow and Washington have talked up the need for a meeting on the conflict between Putin and U.S. President Donald Trump.
Trump has said "nothing's going to happen" on the conflict until he meets Putin face-to-face.
During the Istanbul talks, a Ukrainian source told AFP that Russia was advancing hardline territorial demands that Ukrainian foreign ministry spokesman Georgiy Tykhy called "unacceptable".
Moscow claims annexation of five Ukrainian regions -- four since its 2022 invasion, and Crimea, which it annexed in 2014.
