Spanish PM Pedro Sánchez visits China for fourth time in four years. Spain faces €42.3 billion trade deficit. EU-China trade imbalance labeled 'unsustainable' with 18% deficit rise. Sánchez meets Xi Jinping, Li Qiang, and Zhao Leji. Visits Xiaomi Beijing headquarters for joint ventures. Aims to secure raw materials and green tech access. Trip emphasizes strategic trust amid U.S. policy uncertainty