When the Khmer Rouge came to power in Cambodia in 1975, they inherited a war-ravaged and internationally isolated country. Pol Pot’s government espoused the rhetoric of self-reliance, but Democratic Kampuchea was utterly dependent on Chinese foreign aid and technical assistance to survive. Yet in a markedly asymmetrical relationship between a modernizing, nuclear power and a virtually premodern state, China was largely unable to use its power to influence Cambodian politics or policy. In Brothers in Arms, Andrew Mertha traces this surprising lack of influence to variations between the Chinese and Cambodian institutions that administered military aid, technology transfer, and international trade. Today, China’s extensive engagement with the developing world suggests an inexorably rising China in the process of securing a degree of economic and political dominance that was unthinkable even a decade ago. Yet, China’s experience with its first-ever client state suggests that the effectiveness of Chinese foreign aid, and influence that comes with it, is only as good as the institutions that manage the relationship. By focusing on the links between China and Democratic Kampuchea, Mertha peers into the “black box” of Chinese foreign aid to illustrate how domestic institutional fragmentation limits Beijing’s ability to influence the countries that accept its assistance.

This book aims to provide an analysis of Cambodia-Thailand diplomatic relations over the past seven decades, specifically from 1950 to 2020. While other academic publications have focused on particular aspects of Cambodian-Thai relations (e.g. border conflicts or cultural ties), this book is the first to cover a comprehensive history of diplomatic relations between the two countries starting from the establishment of official diplomatic ties in 1950 to the present. In addition to empirical discussion, it seeks to explain why Cambodian-Thai relationships have fluctuated and what primary factors caused the shifts during the period discussed. In doing so, it employs the “social conflict” analysis, which views states not as unitary actors, but within which are comprised of different societal forces competing with one another and pursues foreign policies in accordance with their own ideology, interest, and strategy. As such, it is postulated that Cambodia-Thailand diplomatic relations should not be seen simply as relations between two unitary states cooperating with or securitizing against one another, but rather as a matrix of intertwining relationships between various social and political groups in both states harboring competing ideologies and/or interests to advance their power positions at home.