In the last week, Ukraine claims to have reclaimed more than 1,000 sq km (385 sq miles) of territory in its south and east of Russia.
More than 30 communities, according to President Volodymyr Zelensky, have been “liberated” in the Kharkiv area.
The leading Russian occupier in the Kharkiv region acknowledged that Ukrainian forces had achieved a “significant victory”
According to Vitaly Ganchev, the Ukrainians have breached the Russian defense line.
One of the most significant metropolitan areas in the region of Kharkiv controlled by Russia, Kupiansk, as well as two other towns, he claimed, were being evacuated of their civilian populations.
The Institute for the Study of War, a think tank, calculated that Kiev’s forces are now only 15 kilometers (9 miles) from Kupiansk, the location of a crucial railway junction that Moscow has been using to supply its troops on the front lines.
It’s claimed that Russia is transporting reinforcements to the area both on land and in the air using massive Mi-26 transport helicopters, which can each hold 80 soldiers.
Ukraine’s army said in a separate Facebook post that forces had pushed 50km in three days (30 miles). If true, that would be the front line’s swiftest movement since the Russian forces’ hasty withdrawal from their positions near the Ukrainian capital of Kiev in March.
The attack south-east of Kharkiv would also put Ukrainian forces closer to Donetsk, a territory in the east where Russia has maintained a strong military presence ever since the conflict broke out six months ago.
Despite a video purporting to show Ukrainian soldiers in the town of Balakliya, Mr. Ganchev further denied that Ukrainian forces had retaken it.
Although the BBC was unable to identify who was in charge of the city, verified social media posts on Thursday showed Ukrainian flags flying from government buildings in the city’s center.
While Ukraine asserts that its troops have advanced in some regions of the nation, there have reportedly been additional Russian aerial attacks in other regions.
Dmytro Zhvytskyi, the governor of Ukraine’s north-eastern Sumy region, claimed on Friday that a Russian airstrike had “destroyed” a hospital and left numerous people wounded.
Allub News has not been able to independently verify the report.