An unknown number of Russian soldiers could be trapped in their own country after Ukrainian forces destroyed three bridges that were their only obvious means of retreat. Two weeks into Ukraine’s counter-invasion it has established two salients on Russian territory southwest of Kursk. Between them is an area roughly 10 km by 20 km, bounded to the south by the Ukrainian border and the north by the Seym River. All three bridges across this section of the river, as well as a pontoon bridge, have been hit. Cut off from resupply, any Russian troops south of the river may have to withdraw as they did from the western bank of Dnipro in the Kherson region in 2022. The question of what Ukraine’s troops are doing in Russia may have an answer to the northeast in Lgov, where a railway junction heavily used to bring weapons and ammunition to the front could soon come within range of Ukrainian artillery.