Morally, the decision facing the European Council in Brussels this week has been a no-brainer. Russia invaded Ukraine illegally and unilaterally. Moscow shows no sign of wanting peace. It actively threatens other countries too, including Britain. Ukraine is running out of money. Yet £184bn worth of Russian assets remain frozen in Europe, notably in Belgium. That money should therefore be mobilised to fund Ukraine. To many, this would be the enactment of a clear and present duty, proof positive that Europe can still be a heavy hitter.

In the messy reaches of the real world, however, things have not been straightforward. Law, economics and politics all managed to insinuate themselves, sometimes venomously, into the intense buildup to Brussels. Reparations can have lethal political consequences. Seizure of assets will undoubtedly face legal challenge. It is also bitterly opposed by Donald Trump, who wants the unfreezing of assets to form........

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