(Bloomberg) -- Two giants in China’s oil and refining sector have taken the biggest opposing positions in Middle East crude trading in years, transforming global cargo flows and puzzling oil traders the world over.Most Read from BloombergRussia Latest: Zelenskiy Adviser Says Wagner Remains in UkraineSilence Cloaks Kremlin After Russian Mutiny Against PutinPutin Faces Historic Threat to Absolute Grip on Power in RussiaPrigozhin Turns Forces Back in Deal With Kremlin to Drop ChargesGoldman Sachs I