Crooked, twisted lines too can result in some weird anomalies. Look at Kaliningrad, a Russian enclave sandwiched between Poland and Lithuania. Consider Cavan, Donegal and Monaghan, three Irish counties lucky enough to be oddly excluded from Northern Ireland on the basis of the relative popularity of religious sects. Imagine the shape of possible boundaries of a homeland for the Kurds or the Basques.
As for freezing battlelines, that is a temporary expedient as the basis for a ceasefire, not a way to settle permanent boundaries. Countries with ephemeral advantages on the battlefront should study Israel’s decision to cede all its conquered strategic depth in the Sinai in return for an unprecedented peace with Egypt.
Turning to modalities, negotiators for Ukraine might be guided by two idiosyncratic bits of advice, one from a poet, the other a novelist. Robert Frost reminded any markers of borders that “good fences make good neighbours”. For his part, William Faulkner insisted that “the past is never dead. It’s not even past.” To summarise their counsel: expecting goodwill to subsume bad memories may be delusional; and historic enmities and entitlements are rarely submerged forever.
On technicalities, mediation may be unavoidable, even though the process entails giving something to everyone instead of curbing and punishing aggression. Can victims of invasions be expected to agree that half a loaf is better than no bread? Involving the United Nations, hobbled by limited enforcement capacities and Security Council vetoes, could create more problems than UN wordsmiths could solve. Relying on contrived and manipulated plebiscites in territories to be transferred is equally problematic; unhappy examples include Crimea recently and Austria in 1938.
Despite all those likely problems, any form of non-violent partition may be preferable to mass, forced population movements. Horrific examples are legion, whether they be Hindu and Muslim in South Asia, Greeks and Turks, the expulsions of Palestinians in 1948 and 1967, or treatment of the Rohingya.
Durability remains crucial. After serial invasions by Germany and Russia, one Polish leader grimly noted that his was “not a country on wheels”. No nation would wish for a history as tragic as Poland’s. Nonetheless, Ukraine might long to end up as stably and securely as Poland now has.