Everything old is new again in international politics. According to Jill Kastner, co-author of A Measure Short of War: A Brief History of Great Power Subversion, today's international tensions over Ukraine, Taiwan and Greenland mark a return to historical normalcy after a brief period of global American unipolarity. Kastner explains that subversion—defined as hostile or unwanted action on a rival's territory—has been a constant tool of statecraft throughout history. She presents subversion as a rational choice between diplomacy and war, where states make cost-benefit calculations about their actions. Citing historical examples from Thucydides’ Athens and Elizabeth I's England to modern-day geopolitics, she explains how nations use subversive tactics when diplomatic channels fail, but war seems too costly. Let’s hope she’s right when it comes to heading off a Chinese war over Taiwan or an American invasion of Greenland.

Dr Jill Kastner is an independent scholar and historian based in London. Her work focuses on international relations from the Cold War to the present, with an emphasis on intelligence and subversive activities both covert and overt. Jill completed her PhD at Harvard in 1999 under the guidance of Ernest May and Philip Zelikow before joining the Presidential Recordings Project at the University of Virginia’s Miller Center for Public Affairs. She has contributed book chapters on various Cold War crises, including Suez and Berlin, and written for The Nation and Foreign Affairs. She served as the executive editor and collaborator for Hope and History: A Memoir of Tumultuous Times, the political memoir of Ambassador William J. vanden Heuvel. She is currently collaborating with William C. Wohlforth on a book about the history of subversion, due out with Oxford University Press next year. Prior to her PhD, Jill worked as a television news producer on Capitol Hill in Washington, DC. She is a member of Chatham House, the Pilgrims of the US/UK, and the Harvard Club of New York.

Named as one of the "100 most connected men" by GQ magazine, Andrew Keen is amongst the world's best known broadcasters and commentators. In addition to presenting KEEN ON, he is the host of the long-running How To Fix Democracy show. He is also the author of four prescient books about digital technology: CULT OF THE AMATEUR, DIGITAL VERTIGO, THE INTERNET IS NOT THE ANSWER and HOW TO FIX THE FUTURE. Andrew lives in San Francisco, is married to Cassandra Knight, Google's VP of Litigation & Discovery, and has two grown children.

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