The rule of non-interference in the internal affairs of the receiving State, which is today enshrined in Article 41 (1) of the Vienna Convention on Diplomatic Relations, contains a fundamental duty of the diplomatic agent. But the Convention does not define the scope and extent of the concept of interference, nor its relationship with norms which inform its character. This thesis investigates a particular form of interference: interference through the diplomatic message. In its first part it examines the problems arising from an analysis of the available sources on the law of diplomatic interference. It also approaches the meaning of "interference" in diplomatic relations and endeavours to come to an understanding of the diplomatic message and its legal bases, and of the legal context of the rule of non-interference.

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La diplomatie commerciale de la Chine résulte d’un processus complexe. Étant donné que d’une part, elle est liée à son histoire, à sa culture et à sa géographie. D’une autre part, elle est vivement rattachée à son régime politique, à l’état de son économie et à son système juridique. Ce qui implique la mise en place d’importantes mesures d’encadrement juridiques et réglementaires émises par l’autorité législative de l’État. Cette thèse tente d’analyser la diplomatie commerciale de la Chine depuis 1978, à travers sa construction, ses règlements et ses pratiques, tout en privilégiant une approche juridique. L’enjeu principal de cette démarche est de mettre en œuvre une étude comparative entre le régime juridique commercial chinois et celui de l’OMC, afin de saisir le fondement juridique de la diplomatie commerciale chinoise. Ainsi, cette recherche se base principalement sur trois dimensions de la diplomatie commerciale chinoise : la dimension multilatérale (l’intégration dans l’OMC), la dimension régionale (la participation dans les organisations régionales comme l’ASEAN) et la dimension bilatérale (la conclusion des accords commerciaux bilatéraux). Enfin, une telle approche permet de mettre en exergue les avantages et les inconvénients de chacune de ces dimensions tout en tenant compte du contexte économique international difficile. / Commercial diplomacy of China is the result of a complex process. Given that on the one hand, it is linked to its history, culture and geography. On the other hand, it is strongly linked to its political system, the state of its economy and its legal system. Which implies the implementation of important measures of legal and regulatory framework emitted by the legislative authority of the state. This thesis tries to analyze the commercial diplomacy of China since 1978, through its construction, its regulations and practices, while favoring legal approach. The main issue of this approach is to implement a comparative study of Chinese commercial law regime and the WTO in order to take the legal basis for China's trade diplomacy. Thus, this research is based on three dimensions of Chinese commercial diplomacy: multilateral dimension (integration into the WTO), the regional dimension (participation in regional organizations such as ASEAN) and the bilateral dimension (the concluding bilateral trade agreements). Finally, such an approach allows to highlight the advantages and disadvantages of each of these dimensions while considering the difficult international economic environment.