OpinionOPINION: Western rebukes help to set stage for closer China and Iran co-operationAgreement said to involve $400 billion in investments in Iran in exchange for a steady supply of oil to ChinaIn agreement: Chinese Foreign Minister Wang Yi (left) meets with Ali Larijani (far right), advisor to Iran's Supreme Leader Ayatollah Ali Khamenei, in Tehran on 27 MarchPhoto: CHINESE EMBASSY IN IRANXu YiheSingapore