Ukrainian troops have seized even more territory from Russian forces as they continue their counter-offensive, the country’s president has said.
Volodymyr Zelensky said troops have now retaken more than 6,000 sq km (2,317 sq miles) from Russian control since September, in the east and the south.
The BBC cannot verify these figures.
Russia has admitted losing key cities in the north-eastern Kharkiv region, in what is seen by some military experts as a potential breakthrough in the war.
Moscow describes its troop withdrawal in recent days as a “regrouping” with the aim of focusing on the Luhansk and Donetsk regions in Ukraine’s east.
That claim has been ridiculed even in Russia, with many social media users there describing the stated pull-out as “shameful”.
Speaking to the BBC on Monday evening, Mason Clark of the US-based think tank the Institute for the Study of War (ISW) said this was “a complete rout” of the Russian troops, who were forced to leave lots of equipment behind.
And the BBC’s James Waterhouse said it was the most significant Russian military retreat since its failed campaign near the capital Kyiv in late March.
In his late video address on Monday, President Zelensky said: “From the beginning of September until today, our warriors have already liberated more than 6,000 sq km of the territory of Ukraine – in the east and south.
The counter-offensive – if confirmed – appears to have been rapid. Last Thursday, President Zelensky said Ukrainian forces had retaken 1,000 sq km, but by Sunday that stated figure had tripled to 3,000 sq km.
Mr Zelensky thanked several of Ukraine’s brigades involved in the counter-offensive, describing their fighters as “true heroes”.
He did not reveal which Ukrainian cities and villages had been liberated.
Russia’s military earlier admitted that its troops had to leave the key cities of Balakliya, Izyum and Kupiansk in the Kharkiv region. Russia now controls only a small eastern part of the region.
Significant advances by Ukrainian troops have also been reported in the southern Kherson region, which borders with Crimea – a Ukrainian peninsula annexed by Russia in 2014.
UK defence officials say the Ukrainian army’s recent successes will have “significant implications” for Russia’s overall operational design.
However, Kremlin spokesman Dmitry Peskov has insisted that military operations in Ukraine will continue “until all the tasks that were initially set” have been fulfilled.
Russia says its forces have been carrying out strikes in those areas retaken by Ukraine in recent days.
Valerii Marchenko, mayor of Izyum, told the BBC the Ukrainian army was in his city and the state flag had been raised.
The military is now engaged in cleaning up the war-torn city and Ukrainian forces are searching for Russian soldiers potentially hiding in people’s houses.
Mr Marchenko said that after “about 10 days”, residents who had to flee the city would be able to return “safely”.
Russia has been accused of targeting civilian infrastructure in revenge for setbacks on the battlefield.
A wave of missile strikes on Sunday caused massive power cuts across north-eastern Ukraine, leaving tens of thousands of people without electricity and running water for several hours.
Ukraine’s rapid gains stun Russia
By Hugo Bachega, BBC News, Kyiv
Ukraine’s rapid progress seems to have stunned Russia. The Kremlin says its troops are regrouping, but pictures from some liberated areas in the Kharkiv region suggest a hasty departure by the invading forces, with military vehicles, ammunition, and equipment left behind.
If the gains are confirmed – and if they hold – it’s the most significant change on the front lines since Russian troops left the Kyiv region five months ago. The extraordinary advance would mark a humiliating setback for Russia, and be a boost to Ukraine’s position that it can push the Russians out while asking for more Western weapons.
President Zelensky has talked about a possible breakthrough, suggesting that more advances could happen before winter. But the country still faces huge challenges. Around a fifth of it remains under occupation and, in the south, Ukrainian troops have reportedly faced more resistance in their offensive, as Russia has fortified its positions.
Ukraine feels it has the momentum, and is pushing forward. But questions remain about how far it can go.
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