Russian main effort is to capture the remainder of Luhansk Oblast and push westward into eastern Kharkiv Oblast and northern Donetsk Oblast.

According to ISW, the Russian army reportedly continued offensive operations along the Kupyansk-Svatove-Kreminna line but made no confirmed advances on September 21.

Map of hostilities in Kharkiv, Luhansk and Donetsk regions / Map: ISW

A Russian milblogger claimed that Russian forces attacked in the direction of Petropavlivka (7km east of Kupyansk) and Synkivka (9km northeast of Kupyansk) but did not specify an outcome. Geolocated footage published on September 21 shows that elements of the Russian 25th Separate Motorized Rifle Brigade (6th Combined Arms Army, Western Military District) operate near Synkivka.

Ukrainian Deputy Director of the Department of Application Planning of the Main Directorate of the Ukrainian National Guard Colonel Mykola Urshalovych stated on September 21 that Russian forces are reinforcing forward tank and assault units in the Kupyansk and Lyman directions.

Ukrainian forces reportedly continued ground attacks along the Svatove-Kreminna line on September 21 but made no confirmed advances.

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