The White House deserves credit for revitalizing diplomacy to end the war in Ukraine. In its haste for a deal, however, its proposals have too often looked indistinguishable from a surrender on Russia’s terms. If the U.S. wants to secure a lasting peace, it will need to put forward a more credible offer — and, most important, increase the pressure on Russian President Vladimir Putin to accept.

According to multiple reports, American negotiators have offered up a ceasefire plan that would leave Russia in de facto control of almost all the Ukrainian territory it currently occupies. In addition to land, Putin would win substantial sanctions relief. The U.S. may also formally recognize Crimea, which Russia illegally annexed in 2014.

Ukraine would be allowed to maintain its military but be offered only vague security guarantees, to be enforced by an ad hoc coalition of allies (not including the U.S.). For at least the duration of the current U.S. administration, it would be barred from joining NATO. Further details would be negotiated after the guns fall silent.

Despite such a favorable offer, Putin seems in no hurry to end his invasion, continuing to demand all four Ukrainian regions he only partially controls. For their part, Ukrainian leaders rightly argue that they need a clearer pledge of continued U.S. military support: not necessarily boots on the ground, but air defense systems, help with cybersecurity and intelligence, and a U.S. backstop for any allied peacekeeping troops.

Otherwise any pause is likely to last only as long as it takes Russia to rebuild its forces. The agreement signed Wednesday to give the U.S. privileged access to Ukraine’s mineral resources is no substitute.

The White House ought to keep two things in mind. First, it cannot expect Ukrainians simply to accept a capitulation they anticipate will lead to a renewed assault. While they have little hope of ejecting Russian forces in the near term, their defenses have been stout. The country now boasts Europe’s largest standing army and manufactures many of its own weapons. Its people are weary of war but not ready to give in.

Second, Russia’s advantages aren’t as decisive as they appear. Over the past three years, its troops have advanced slowly and at enormous cost. Its war economy is straining under high inflation, labor shortages, soaring interest rates and dwindling foreign reserves. After purportedly topping 4% last year, growth has sputtered to around 0%, according to Goldman Sachs Group Inc. Lower oil prices have dented a major source of budget revenue.

The longer the war drags on, the greater the risk of economic collapse and social unrest at home. Putin has good reason to seek a deal — and reason to fear American pressure if he does not.

U.S. officials have implied that they’ve presented their final offer and are prepared to “walk away” if the two sides cannot agree. Certainly, that would be wiser than underwriting a sham settlement that rewards aggression and invites future wars.

A better strategy, though, would be to make clear the U.S. is willing to provide logistical help to peacekeepers on the ground, continued aid for Ukraine’s military and defense industries, and backing for the country’s integration into Europe’s security architecture and eventual membership in the European Union.

Simultaneously, American officials should let the Kremlin know that if it continues to balk, the U.S. will further tighten sanctions, including secondary measures against buyers of Russian oil, and take steps to strengthen Ukraine’s ability to defend itself. U.S. military aid and intelligence will flow unimpeded.

No matter what deal he signs now, Putin will likely continue to view Ukraine as Russian and Ukrainians’ freedom as a threat. To endure, any peace agreement must therefore include a substantive deterrent against future aggression. The U.S. ought to provide it.

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The Editorial Board publishes the views of the editors across a range of national and global affairs.

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