At the heart of the West’s response to Russia’s invasion of Ukraine sits an ambiguity that it is convenient, perhaps even necessary, for our political leaders to maintain. If we can turn the clock back on Putin’s foolish endeavour – if he can be persuaded to withdraw his troops, disavow Russia’s territorial ambitions and return to the status quo ante – then, with Ukraine again an autonomous and independent country, does the West also return to the status quo ante in our own dealings with Russia?

The answer to this question matters enormously, because if we’re holding out to Moscow an...