Red lines and the credibility arms race

• …every power ought to be commensurate with its object…
• …the means ought to be proportioned to the end…
• …there ought to be no limitation of a power destined to effect a purpose, which is itself incapable of limitation…
• A government ought to contain in itself every power requisite to the full accomplishment of the objects committed to its care, and to the complete execution of the trusts for which it is responsible, free from every other control but a regard to the public good and to the sense of the people.
• As the duties of superintending the national defense and of securing the public peace against foreign or domestic violence involve a provision for casualties and dangers to which no possible limits can be assigned, the power of making that provision ought to know no other bounds than the exigencies of the nation and the resources of the community.
• As revenue is the essential engine by which the means of answering the national exigencies must be procured, the power of procuring that article in its full extent must necessarily be comprehended in that of providing for those exigencies.

John Quincy Adams, a student as well as a practitioner of statesmanship, believed that governments understand their own and others’ interests quite well. His involvement in diplomacy, which lasted from 1778 to the end of his presidency in 1829, convinced him not that negotiations are superfluous, but rather that they ratify the several parties’ recognition of existing realities regardless of agreements or lack thereof. Diplomacy can make it more comfortable to live with reality by clarifying mutual understanding of it. On the other hand, Adams’ magisterial notes on his 1823 recommendation that America spurn the invitation to join Britain in a declaration disapproving any attempt to recover Spain’s American colonies—that jointness would have added nothing to the reality of parallel British and U.S. opposition to such a venture—underlines the central fact about diplomacy: though it conveys reality, it does not amend it.

In 1968, Fred Ikle published How Nations Negotiate, which is used by diplomatic academies around the world. Too many graduates, however, forget its central teaching, which is that the diplomat’s first task is to figure out whether agreement is possible on the basis of “the available terms”—in short, whether both sides’ objectives, though different, are compatible. Only if they are can negotiations proceed according to what Ikle calls “rules of accommodation”—making sincere proposals, honoring partial agreements, etc. If the objectives are incompatible, the diplomats may choose to walk away, or to “negotiate for side effects”—to use the negotiations to undermine the other side’s government, sow dissention among its allies, deceive it, pocket partial agreements and renege on commitments, buy time, gather intelligence, etc. Disaster looms when one side follows the rules of accommodation while the other negotiates for side effects. The essence of Ikle’s teaching is that the negotiator’s primordial job is to judge correctly whether the other side is negotiating for “available terms” or is waging war through diplomatic means, and hence to choose whether to negotiate for agreement, walk away, or treat the diplomatic table as a battlefield. That choice is “perpetual,” he writes, because human motives are variable.

When the president publicly drew his red line:

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