By Ron Bousso and Chen Aizhu LONDON/SINGAPORE (Reuters) – China’s top offshore oil and gas producer CNOOC Ltd. is preparing to exit its operations in Britain, Canada and the United States, because of concerns in Beijing the assets could become subject to Western sanctions, industry sources said. Ties between China and the West have long been strained by trade and human rights issues and the tension has grown following Russia’s invasion of Ukraine, which China has refused to condemn. The United States said last week China could face consequences if it helped Russia to evade Western sanctions th…

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