(Reuters) -President Volodymyr Zelenskiy said on Sunday that Ukrainian forces had advanced in border districts of northern Sumy region, an area where Russian troops have tried for months to establish a foothold.

Zelenskiy, speaking in his nightly video address, also quoted Ukraine’s top commander as saying Moscow’s forces had suffered significant losses in Donetsk and Kharkiv regions along the 1,000-km (620-mile) frontline.

Zelenskiy was speaking after a week of Russian statements underscoring what Moscow described as gains in central Dnipropetrovsk region.

Russian troops are engaged in a slow push across eastern Ukraine, with nearly daily announcements of captured villages.

Moscow has annexed four regions it has partially occupied — Donetsk, Luhansk, Zaporizhzhia and Kherson — but not

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