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b'Russia has invaded Ukraine. This horrible global crisis raises questions about Putin\\u2019s ultimate ambitions, and how nations can make credible deterrent threats in incredible circumstances.\\n \\nWe\\u2019re not experts on the Ukraine conflict, but we can dive into the political science research to get some clarity on the underlying dynamics that may be at play. And there\\u2019s no better paper to turn to than \\u201cFear, Appeasement, and the Effectiveness of Deterrence\\u201d from Alexander V. Hirsch at Caltech.'