The broadside came as Washington and Seoul echoed warnings from Ukraine that North Korean troops had begun engaging in combat operations alongside Russian forces on the border between the warring countries.
A security source in Kyiv meanwhile told reporters that Ukraine was behind the assassination of a high-ranking Russian naval officer in a car bombing on the annexed Crimean peninsula.
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Ukraine’s air force said its units had downed four missiles and 37 drones launched by Russia over eight regions of Ukraine overnight and into Wednesday morning.
The large-scale bombardment comes at a critical moment on the battlefield. Russian forces are advancing in the east and concerns are growing over future aid for Ukraine after US Donald Trump’s victory in presidential elections.