By Simon Lewis KREMENCHUK, Ukraine (Reuters) -Two Russian missiles slammed into a crowded shopping centre in the central Ukrainian city of Kremenchuk on Monday, killing at least three people and wounding 40, senior Ukrainian officials said. The attack caused a huge fire and sent dark smoke billowing into the sky, footage circulated by President Volodymyr Zelenskiy showed. A Reuters reporter saw the charred husk of a shopping complex with a caved-in roof. Firefighters and soldiers were pulling out mangled pieces of metal as they searched for survivors. “We don’t understand how many people could…