By Victoria Butenko, Helen Regan, Max Saltman, Daria Tarasova-Markina (CNN) — Ukraine’s capital Kyiv came under a deadly Russian attack early Monday morning, on the eve of a critical NATO summit in Turkey that US President Donald Trump plans to attend. Massive explosions lit up the night sky as ballistic missiles and drones hammered parts of the city, killing at least 15 people in the city and three others in the surrounding region, with dozens more wounded, city officials said.