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In June 1954, Wei attended the 1954 Geneva Conference on Indochina with Premier Zhou Enlai, USSR Foreign Minister Vyacheslav Molotov, Vietnamese representative Phạm Văn Đồng, US State Department official Bedell Smith and UK Deputy Under Secretary for Foreign Affairs for Administration Anthony Eden. Wei was specifically instructed to discuss military matters with the Vietnamese delegation when Molotov, Smith and Eden were not present.