The Ukrainian city of Sumy is near the Russian border, but far from the current front. Russia has amassed tens of thousands of troops in the region and occupied several villages. Could a greater incursion be coming?

Russian forces are advancing in the northern Ukrainian region of Sumy, bringing the regional capital within range of their drones and artillery, according to Ukrainian officials and analysts.

Russian forces on Wednesday advanced further into Ukraine's northern region of Sumy, threatening the regional capital after taking more than 150 square km (58 sq miles) of the area in less than two weeks,