The Ukrainian armed forces appear (and I emphasize appear) to have taught the rest of the world yet another lesson in the need to be cautious about knowing what we know.

If the reports of the last few days are correct, then the chances of a Ukrainian "victory” have risen sharply, just as have the chances that the war’s aftermath will at last lead to the downfall of Vladimir Putin in Russia.

The odds on a lengthy stalemate that can mostly be ignored by the rest of the world (a sort of wider-scale version of the situation that had adhered since Russia’s first incursions into the Donbas in 2014) do appear to have been reduced.