KYIV — Ukraine has lost over 40 per cent of the territory in Russia's Kursk region that it captured in a surprise incursion in August as Russian forces have mounted waves of counter-assaults, a senior Ukrainian military source said.

The source, who is on Ukraine's General Staff, said Russia had deployed 59,000 troops to the Kursk region since Kyiv's forces swept in and advanced swiftly, catching Moscow unprepared 2-1/2 years into its full-scale invasion of Ukraine.

"At most, we controlled about 1,376 square kilometres (531 square miles), now of course this territory is smaller. The enemy is increasing its counterattacks," the source said.

"Now we control approximately 800 square kilometres (309 square miles). We will hold this territory for as long as is militarily appropriate."

With the thrust into Kursk, Kyiv aimed to stem Russian attacks in eastern and northeastern Ukraine, force Russia to pull back forces gradually advancing in the east and give Kyiv extra leverage in any future peace negotiations.

But Russian forces are still advancing in Ukraine's eastern Donetsk region.

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