Russia's military captured a British national fighting with Ukrainian troops who have occupied part of Russia's Kursk region, according to reports Monday, as Moscow began daylight drone attacks on civilian areas of Ukraine and its ground forces accelerated gains along parts of the front line.

Video posted on Russian social media channels showed a young bearded man in military clothing. The captive said he was a former British soldier.

Russia and Ukraine have traded air strikes, after a week of intensifying rhetoric in which Russia tested a new missile on Ukraine. Russia has made close to 1,500 strikes on Ukraine since Sunday evening on about half of the country's regions causing dozens of injuries, Ukrainian President Volodymyr Zelensky said.