The key question is not whether an eventual peace accord ending the fighting in Ukraine will require Kyiv to accept Moscow's continued possession of Crimea and at least a portion of Ukraine's Donbas region.  Anyone with a modicum of realism understands that such territorial concessions are unavoidable if the bloody war of attrition is to end.  The real issue involves the demand of Ukraine and of its fan club in NATO that Kyiv be given "security guarantees" in exchange for accepting that reality.  Agreeing to such an open-ended commitment could ultimately prove fatal to the United States.

Trump has attempted to steer a middle course to accommodate the competing demands and extricate Washington from its entanglement in NATO's dangerous proxy war using Ukraine as a weapon against Russia.  He has told Ukraine leader Volodymyr Zelensky repeatedly that his country must at least make some territorial concessions – especially Crimea.  Trump also has indicated that Ukraine must give up its aspirations for official NATO membership.  However, he has been receptive to endorsing vaguely conceived security commitments to shield Ukraine from any further coercion by Russia.

Extending a U.S. security guarantee to Kyiv could take two forms – both of them bad from the standpoint of America's genuine interests and well-being.  One version could consist of pledges from individual European NATO powers – especially major players such as Great Britain, France, Germany, Poland, and Turkey–as well as the United States to enforce a peace accord between Kyiv and Moscow.  Another equally dangerous option would be to establish an explicit pledge from NATO as an alliance to come to Ukraine's defense if it is the victim of renewed aggression from Russia.  In essence, that move would make Ukraine a de facto NATO member, even though Kyiv apparently would not have the right accorded to formal members to vote on Alliance decisions.  Any version of a security guarantee also is almost certain to include a peacekeeping contingent to enforce a ceasefire or a full-blown peace agreement.  However, Russian leaders insist that such a deployment must never take place without Moscow's explicit consent.

Unfortunately, the Western powers may seek to implement the scheme of deploying peacekeeping troops along with a robust NATO security guarantee to Kyiv in defiance of Moscow's wishes.  NATO countries have already blurred and expanded the security pledge contained in Article 5 of the North Atlantic Treaty to consider an attack on any Alliance member to be an attack on all members and to provide aid to the victim.  Since Russia's expanded military operations in Ukraine began in February 2022, the United States and other key NATO nations have treated Ukraine as though it were already an integral part of the alliance.