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It would be wrong to say Russia’s full-scale invasion of Ukraine, four years ago this week, came out of the blue. For months there had been worrying reports of a huge build-up of Russian troops on Ukraine’s border. Through the winter of 2021/22, Moscow scoffed at suggestions it was planning to invade its neighbour as “alarmist”. But at the same time the Russian president, Vladimir Putin, was making aggressive noises, issuing demands for Nato to pull its troops back from its eastern front and calling for a ban on Ukraine’s accession to the western alliance.