Spanish Prime Minister Pedro Sanchez is set to visit China later this year, as tensions with the United States prompt more European countries to rethink ties with Beijing. A source familiar with the talks said the two sides were discussing details of the trip. If it goes ahead, it will be Sanchez’s fourth to China in four years. Miguel Otero-Iglesias, a senior analyst at the Madrid-based Elcano Royal Institute, said the prime minister had suggested in the past that visits to China should be an...