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

KYIV, Ukraine >> Ukraine has lost over 40% of the territory in Russia’s Kursk region that it seized in a surprise incursion in August as Russian forces have mounted waves of counterassaults, a senior Ukrainian military source said.

Faced with waves of counterattacks from nearly 60,000 Russian troops, Ukraine has lost more than 40% of the territory it once controlled in its August invasion of Kursk, Reuters reported, citing a member of the Ukrainian General Staff.