A photograph taken on September 10 , 2022, shows Ukrainian flags placed on statues in a square in Balakliya, Kharkiv region, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

A man rides a bicycle past a destroyed building in Balakliya, Kharkiv region, on September 10, 2022, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

A woman rides a bicycle in a street in Balakliya, Kharkiv region, on September 10, 2022, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

Children play in a park in Balakliya, Kharkiv region, on September 10 , 2022, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

A photograph taken on September 10, 2022, shows abandoned weapons crates in Balakliya, Kharkiv region, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

Destroyed armored vehicles litter the road in Balakliya, Kharkiv region, on September 10, 2022, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

A car drives past a destroyed armored vehicle in Balakliya, Kharkiv region, on September 10, 2022, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

A man rides a bicycle past parts of a destroyed armored vehicle on a road in Balakliya, Kharkiv region, on September 10 , 2022, amid the Russian invasion of Ukraine. - Ukrainian forces said on September 10, 2022 they had entered the town of Kupiansk in eastern Ukraine, dislodging Russian troops from a key logistics hub in a lightning counter-offensive that has seen swathes of territory recaptured. (Photo by Juan BARRETO / AFP)

This photograph taken on September 10, 2022, shows abandoned weapons crates in Balakliya, Kharkiv region, amid the Russian invasion of Ukraine. - Moscow's announcement alongside Kyiv's claim to have entered the town of Kupiansk are the most significant shifts in battlefield dynamics after months of fighting in eastern Ukraine that has been dominated by Moscow. (Photo by Juan BARRETO / AFP)

This photograph taken on September 10, 2022, shows abandoned weapons crates in Balakliya, Kharkiv region, amid the Russian invasion of Ukraine. - Moscow's announcement alongside Kyiv's claim to have entered the town of Kupiansk are the most significant shifts in battlefield dynamics after months of fighting in eastern Ukraine that has been dominated by Moscow. (Photo by Juan BARRETO / AFP)

This photograph taken on September 10, 2022, shows abandoned weapons crates in Balakliya, Kharkiv region, amid the Russian invasion of Ukraine. - Moscow's announcement alongside Kyiv's claim to have entered the town of Kupiansk are the most significant shifts in battlefield dynamics after months of fighting in eastern Ukraine that has been dominated by Moscow. (Photo by Juan BARRETO / AFP)