The indivisibility of public faith

National Review's lead puts the proposition plainly: the stronger and more united NATO remains, the less incentive Beijing will have to test American resolve elsewhere. I find this persuasive — not because of any calculation I could make about missile ranges or carrier groups, which lie beyond my competence, but because the underlying logic is as old as the law of nations itself.

A treaty is not merely a document. It is a demonstrated willingness to be bound — to subordinate immediate convenience to a prior, publicly stated obligation. When a nation honors its commitments under pressure, every other party to every other agreement takes note. When it does not, they take equal note. The reputation for fidelity is the only collateral a republic can pledge that requires no treasury and no army to maintain.

The argument in the National Review piece rests, I infer, on the premise that Beijing watches NATO cohesion closely when it calculates the costs of moving against Taiwan or other partners in the Pacific. That inference strikes me as sound on its face. I cannot speak to the specific intelligence, but I can say this: I saw in my own time how Britain's handling of its obligations under the Treaty of Paris shaped French and Spanish calculations about what the young United States might be worth as an ally. Credibility travels. Its absence travels faster.

There is a further point worth stating carefully. The temptation in any republic is to treat each alliance as a discrete transaction — useful until costly, then expendable. That is a merchant's view of a diplomat's instrument. An alliance is not a bill of sale. It is a convention among parties who have each staked something on the other's continued good conduct. To withdraw that stake unilaterally, or to signal that one might, is to impose a loss on every partner simultaneously — including those whose theaters of concern you have not yet begun to think about.

The practical counsel that follows from all of this is modest but firm. Those charged with American foreign policy should resist the temptation to treat European and Pacific commitments as a portfolio to be rebalanced toward the more pressing threat. They are better understood as a single instrument of credibility, the integrity of which depends on its being played whole. Weaken one string and the others go out of tune. That is not sentiment; it is the structure of deterrence as the law of nations has always understood it.