Analysts: Russia suffered its biggest monthly territorial loss in Ukraine in over three years in September

The Finland-based independent military analysis center Black Bird Group reports that the area of Ukrainian territory under Russian military control decreased by approximately 190 square kilometers in September. According to the center's assessment, this marks the largest net monthly territorial loss for the Russian army in more than three years, with a comparable decline last recorded in June 2023.

What it suggests

The finding points to at least a temporary shift after a long stretch in which the front line in Ukraine had generally moved in Russia's favor. Black Bird Group is one of several analytical groups that track changes along the front line using available open-source data on controlled territory.

The source report does not specify the reasons behind the Russian army's territorial loss in September, nor does it identify the exact locations where these changes occurred. It is also unclear whether this trend continued into October.

The report comes as the war in Ukraine enters its fourth year, with both sides regularly releasing differing assessments of front-line movement. Data from independent analytical centers are often used as an additional reference point alongside official statements from Ukraine and Russia, which frequently diverge.