Ukraine and Russia continued their attacks on Monday evening, with Ukrainian President Volodymyr Zelensky accusing Moscow of using North Korean missiles.
Zelensky has said that the attacks in Zaporizhzhia, which killed at least six people and injured at least 19 others, involved ballistic missiles from a Russian ally.
In Voronezh, in southern Russia, Ukraine has raided the warehouses of the online sales company Wildberries.
The company, known as the "Amazon of Russia," has been targeted several times in recent weeks.
The attacks come a day after at least 13 people, including a child, were killed by Ukrainian drone strikes in the Russian republic of Tatarstan, more than 1,100 kilometers from the border with Ukraine.
In a video message on Monday evening, Zelensky said that "for the first time" Russia "cannot wage war without reinforcements from North Korea."
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"The more attacks from North Korea here, in Ukraine and in Europe, the more their missiles and soldiers are used, the more they correct their shortcomings and weaknesses," Zelensky said, adding that this poses a danger to the rest of the world.
It is not the first time Zelensky has accused Russia of receiving military aid from North Korea.
Over the weekend, he warned that up to 50,000 North Korean soldiers were being sent to fight alongside Russian forces.
