Ukrainian troops confirm entering Kupiansk, Kharkiv Oblast.
The Security Service of Ukraine posted a photo of special operations forces in Kupiansk after unverified reports of the liberation of the city on the morning of Sept. 10. The liberation of Kupiansk, which had a peacetime population of 28,000, is one of the most significant Ukrainian victories since Russian troops withdrew from the north of Ukraine in April, and represents a likely near total collapse of Russian defenses in the region.