But perhaps this flaw can be overcome. In theory, technical innovation in the miniaturisation of warfare might offer new ways of ensuring peace, and France and the United Kingdom — both nuclear powers — could step in as America steps back.
Now is the time to consider such possibilities. Speaking at the Ukraine Defence Contact Group in Brussels this week, US Secretary of Defence Pete Hegseth appears to have just surrendered many of the key elements that would have been subject to negotiations. Before talks have even begun, the US says it will impose territorial losses on Ukraine and bar it from joining NATO. Worse, these comments were immediately followed by a euphoric social-media post from Trump about a conversation he had with Vladimir Putin.
With both parties in the war near exhaustion, it is not foolish to explore the options for achieving a lasting peace in the absence of complete capitulation by one side. But the path Trump has chosen leads directly into an impossible thicket. A lasting and credible solution requires removing the cause of war. But what is that cause?