KYIV, Ukraine, Aug 1, 2025 (BSS/AFP) - Ukrainian rescue workers on Friday uncovered the body of a two-year-old, as they finished work following a Russian attack the day prior that killed 31 people in all.

Kyiv observed a day of mourning after the deadliest attack in the Ukrainian capital this year ripped open a nine-storey residential building, wounding 159 people and claiming the lives of five children.

"This despicable attack by Russia shows that additional pressure and sanctions on Moscow are necessary," Ukrainian President Volodymyr Zelensky said Friday, announcing rescue operations had wrapped up.

"We appreciate that (US) President (Donald) Trump, European leaders and our other partners clearly see what is happening and condemn Russia," he added.

EU foreign policy chief Kaja Kallas on Friday described the Russian attacks as "depraved" and posted a picture of the bloc's flag at half mast.

"More weapons for Ukraine and tougher sanctions on Russia are the fastest way to end the war. Getting more air defenses to Ukraine fast is our priority," she added in a post.

Separately, one person was also killed in a Russian attack early Friday on Zaporizhzhia, in southeast Ukraine, the region's military administration said on Telegram.

Another was killed in the northeastern Kharkiv region, officials said, while the toll from another strike on Thursday -- this time in Kramatorsk further south -- rose to three.

Thursday's attack was among the deadliest the capital has seen since Russia launched its large-scale offensive in February 2022.

Trump on Thursday blasted Russia's actions in Ukraine, suggesting that new sanctions against Moscow were coming.

"Russia -- I think it's disgusting what they're doing. I think it's disgusting," Trump told journalists.

On Monday, the US leader issued a "10 or 12" day ultimatum for Moscow to halt its invasion, now in its fourth year, or face sanctions.