Legal analysis: the same reason: the situation of the cold war, the consistency of ideology, and the influence of the Korean War. The reasons are different: the United States is powerful and attempts to dominate the world; Britain's strength is weakened, Hong Kong is an East Asian trade center, and the comprehensive embargo harms Britain's interests; China's attitude and strategy.

Legal basis: People's Republic of China (PRC) Foreign Trade Law.

Article 4 The State practices a unified foreign trade system, encourages the development of foreign trade and maintains a fair and free foreign trade order.

Article 5 On the basis of equality and mutual benefit, People's Republic of China (PRC) promotes and develops trade relations with other countries and regions, signs or joins regional economic and trade agreements such as customs union agreements and free trade zone agreements, and participates in regional economic organizations.