Gamlet Zinkivskyi grew up speaking Russian in the city of Kharkiv, just like his parents. But when Vladimir Putin launched the invasion of Ukraine on 24 February, it was the final push for him to switch fully to Ukrainian. ... As a young artist, Zinkivskyi had a longstanding dream: an exhibition in Moscow. Kharkiv is just a few dozen miles from the border with Russia and has long been almost entirely Russian-speaking. Culturally, Moscow felt like the centre of the universe. But when Zinkivskyi finally made it to a gallery there in 2012, he was horrified. “They were obnoxious and...