https://www.bbc.com/news/articles/cr7rn98l8kjoRussia struggles to repel Ukraine's deep Kursk incursion
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Ukrainian troops remained in Russia’s western Kursk region on Friday night, as its surprise cross-border offensive into Russia came to the end of a fourth day.
The Russian defence ministry said it was “continuing to repel” Ukraine’s military, which it claimed had lost more than 280 personnel in the past 24 hours - a figure that has not been independently verified.
Reports suggest that Ukrainian troops are operating more than 10km (six miles) inside Russia - the deepest cross-border advance by Kyiv since Moscow launched its full-scale invasion of Ukraine in February 2022.
Ukraine has not openly admitted the incursion, but President Volodymyr Zelensky said on Thursday that Moscow must "feel" the consequences for its invasion.
Fighting in Kursk has edged gradually closer to a nuclear power plant, prompting the UN nuclear agency to release a statement urging the two sides to “exercise maximum restraint”.
International Atomic Energy Agency (IAEA) chief Rafael Grossi appealed to all sides to take measures “to avoid a nuclear accident with the potential for serious radiological consequences”.
Some residents of the Kursk region were evacuated by authorities, with a group pulling into Moscow’s central train station on Friday. One unnamed resident told AFP news agency: "It's terrible. They are bombing.”
Overnight, Ukraine's military said it had struck a military airfield deep inside Russia, destroying a warehouse containing hundreds of glide bombs.
The targeting of the Lipetsk air base, more than 350km (217 miles) from Ukraine's border, is the kind of operation Kyiv has been wanting to do for some time.
The weaponry it managed to destroy in the attack is the very kind Russia has used to terrorise Ukrainian towns, cities and military positions for most of its invasion.
The military's statement also said the airfield was known for housing Russia's Su-34, Su-35 and MiG-31 war planes.
Russian authorities nearby said a state of emergency was in place in the area, confirming what they described as “detonations” at an "energy infrastructure facility". Residents of four nearby villages were being evacuated.
Hours after Ukraine’s strikes, Russia responded by striking a shopping centre in the Ukrainian town of Kostyantynivka, close to the frontline in the eastern Donetsk region, killing at least 14 people and injuring 43, Ukrainian officials say.
Residential buildings, shops and more than a dozen cars were also damaged in the attack.