Russia’s victory in the eastern Ukrainian city of Avdiivka this month, and its subsequent smaller victories since then, is heightening concerns of a Russian counteroffensive.

Ukrainian forces withdrew from the eastern city in the Donetsk oblast, providing Russia’s military with its first major battlefield victory since seizing the eastern city of Bakhmut last May. The Ukrainians withdrew after facing shortages of ammunition and air defenses, while Russian forces have also been able to take some other towns and villages since then.