The Russian army's advance in Ukraine slowed again in September, especially in the Donetsk region, according to an AFP analysis of data from the U.S.-based Institute for the Study of War (ISW).

In one month, Moscow's forces seized a total of 447 square kilometers from Ukraine, accelerating a slowdown that began in August, the ISW data showed.

Russia controls more than 19% of Ukrainian territory, including areas Moscow-backed forces took after 2014.