What’s the mood in Kyiv?

Vladimir Putin, Russia’s president, has declared a “special military operation”, starting a war against Ukraine. He claims his aim is to “denazify” the country and protect Russia. Railing against the West, he threatens severe retaliation if others intervene. What’s happening in Ukraine now, and how will the war unfold? Richard Ensor, The Economist’s correspondent, reports from the capital, Kyiv.