KHERSON, Ukraine—Russian forces stepped up their shelling of the southern city of Kherson, killing seven people and injuring at least 21 others in the latest round of strikes, according to local officials.

Two weeks have passed since Russian troops retreated from Kherson, and residents—though still joyous at their liberation from Russian occupation—are confronting a new set of challenges. The city, like much of Ukraine, remains without electricity, heat or running water. Cell signal is weak. Tents offering heat, water and internet access have been set up around the city.