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In this article, the author explores the complex links between global crises and wars. In the first part, he preliminarily develops the notions of crisis (sub-part 1) and war (sub-part 2), in order to resituate them both in the current neoclassical mainstream in economics and in heterodox thoughts, with particular emphasis on Marxism. In a second part, the nature of the relationships between global crises and wars is examined from an economic point of view, from both a theoretical and a historical perspective (sub-part 1). Then, the systemic contradictions that such relationships between crises and wars contribute to accelerating are analyzed (sub-part 2). Finally, the reader’s attention is directed toward new underlying risks, in particular those that have recently arisen in the context of the new “Cold War” between the United States and China, with illustrations proposed around reflections on the Sino-US trade war, as well as on the dollar-yuan currency war (sub-part 3).