"Better to jaw-jaw than to war-war," Winston Churchill once quipped, showing that not even tough-minded war leaders prefer war to diplomacy in principle. But deciding when to negotiate with foreign adversaries, what to say to them, and when to resort to methods other than talk is not simple. In efforts to resolve international problems,every course of action including straightforward,non-coercive diplomacy has its pros and cons.

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President Donald Trump shakes hands with President of the European Commission Ursula von der Leyen as he announces a trade deal with the EU at Trump Turnberry golf club on July 27, 2025, in Turnberry, Scotland. (Andrew Harnik via Getty Images)