BELGOROD, Russia — The sounds of sirens, the rush toward the nearest shelter, then the echoes of anti-aircraft fire and the anxious wait for calm after the storm. This has become a daily routine for residents of Belgorod, a city located 30 kilometers from the Ukrainian border, as they were called to the polls for this weekend’s presidential election. As the polls opened for the third and final day of the vote, Ukrainian shelling hit a house, killing a 16-year-old girl and injuring her father, authorities said. Later in the day, another strike killed a man in a parking lot and wounded 11. “Of c…