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The dangers associated with the entanglement of nuclear and conventional forces have become an area of increasing concern. In this article, I survey the growing nuclear-conventional entanglement risks in Northeast Asia as well as the ways in which entanglement is driving a new era of nuclear arms racing in response. In order to better manage the risks of nuclear crises occurring, I outline the need for a greater emphasis on assurance policies to match the current focus on making deterrent threats. Given the high chance of such crisis nevertheless occurring in Northeast Asia in the years ahead, I make the case for developing what I call “crisis management interoperability” between allies armed with nuclear and strategic non-nuclear weapons. Such interoperability is aimed at ensuring that the difficult task of crisis signalling is not further complicated by alliances with entangled nuclear and conventional forces.