Ukrainian President Volodymyr Zelenskiy said on Monday that more than 3,000 North Korean soldiers have been killed and wounded in Russia's Kursk region and warned that Pyongyang could send more personnel and equipment for Moscow's army.

Some 3,700 tons of low-grade fuel oil have spilled into the Black Sea since two Russian oil tankers were severely damaged in a storm on Dec. 15.

Authorities in Russia’s southern region of Krasnodar declared a region-wide emergency as oil continued to wash ashore, 10 days after two tankers collided in the Black Sea. View on euronews

Russia launched aerial attacks on Ukraine’s energy sector “on a massive scale” overnight into Wednesday, local authorities said, with explosions reported across the country amid intensified bombardments that have left Ukraine in a precarious position while the war grinds into a third winter.

Russia attacked Ukraine's energy system and some cities with cruise and ballistic missiles plus drones, Ukraine's President Volodymyr Zelenskiy said.

Ukraine's air force says it detected 184 missiles and drones, causing damage to energy infrastructure across the country.