此次正式访问充分表明，中德双方致力于维护稳定和建设性的双边关系，愿在符合双方共同利益的领域深化合作，并通过坦诚开放、相互尊重的对话妥处分歧。
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But they failed to invest in maintaining oil production levels, which have plummeted in recent years – partly, but not solely, because of US sanctions, which could now be revised.
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