Russian air attacks on major Ukrainian cities including Kyiv, Dnipro and Kharkiv killed at least five people and wounded dozens early on Tuesday, authorities said, after days of warnings that Moscow was planning a major assault. Four people were killed and 16 injured in a Russian attack on Dnipro, in eastern Ukraine, regional governor Oleksandr Hanzha said on Telegram. All those injured were hospitalised and were reported to be in a moderate condition, he said, posting pictures of heavily damaged residential buildings, burnt-out vehicles and a destroyed children's playground. In Kyiv, at least one person was killed and 29 others were injured across the capital, according to Tymur Tkachenko, the head of the capital's military administration. Read moreTalk to Russia? First, Europe needs to pick an envoy – and know what it wants to say Kyiv Mayor Vitali Klitschko said a suspected missile strike on a 24-storey apartment building triggered a collapse, with people likely trapped under the rubble. Other buildings, including a nine-storey apartment block, caught fire from suspected missile debris, he said. “In the Obolon district, cars are burning after being struck by falling missile debris. There are also fires at two locations in open areas, including one near a kindergarten,” Klitschko said. Thousands of Kyiv residents were taking refuge in metro stations and other shelters, witnesses said, after air raid warnings covered much of the country early on Tuesday. Warnings of a major attack Ukrainian President Volodymyr Zelensky on Monday reiterated warnings of a potentially major assault and urged residents to pay special attention to air raid alerts. “Intelligence warnings regarding Russian strikes remain in effect. A massive strike is possible, they have prepared one,” Zelensky said in his nightly video address. “Our defenders are ready 24/7 to the fullest extent possible with the supplies currently available.” Russia last week warned that it intended to launch “systematic strikes” on targets in Kyiv linked to the Ukrainian military as well as decision-making centres, and urged foreigners to leave. It said the action was in response to a drone strike last month on a dormitory in Ukraine's Russian-held Luhansk region, which killed 21 people. Ukraine denied carrying out the attack. Read moreUkraine: How a kamikaze drone partially operated by AI is attacking Russian convoys In Ukraine's north-eastern Kharkiv region, 10 people, including a child, were injured in drone and missile attacks, Mayor Ihor Terekhov said on Telegram. Reuters could not independently verify all the reports. Russia has targeted Ukraine's power supplies and infrastructure, while Ukraine has stepped up attacks on oil facilities inside Russia this year, sometimes resulting in casualties. Both sides deny targeting civilians. The war in Ukraine has ground on for more than four years since Russia launched its full-scale invasion in February 2022. Efforts to end the conflict have made little progress, with the administration of US President Donald Trump focused on conflicts in the Middle East. (FRANCE 24 with Reuters)