These theories all seem to confuse what is desirable with what is likely, and what is morally ideal with what is strategically achievable. I have written previously about the risks of nuclear escalation in the event of a Russian military collapse, risks that hawkish theories understate. But given the state of the war right now, the more likely near-future scenario is one where Russian collapse remains a pleasant fancy, the conflict becomes stalemated and frozen, and we have to put our Ukrainian policy on a sustainable footing without removing Putin’s regime or dismantling the Russian empire.

In that scenario, our plan cannot be to keep writing countless checks while tiptoeing modestly around the Ukrainians and letting them dictate the ends to which our guns and weaponry are used. The United States is an embattled global hegemon facing threats more significant than Russia. We are also an internally divided country led by an unpopular president whose majorities may be poised for political collapse. So if Kyiv and Moscow are headed for a multiyear or even multi-decade frozen conflict, we will need to push Ukraine toward its most realistic rather than its most ambitious military strategy. And just as urgently, we will need to shift some of the burden of supporting Kyiv from our own budget to our European allies.

Those goals are compatible with what we’ve done to date, and they can obviously be adapted if better opportunities suddenly arise. But a good strategic theory needs to assume difficulty, challenge, limits. The danger now is that the practical achievements of our hawkish policy encourages the opposite kind of theorizing, a hubris that squanders our still-provisional success.