Ukraine is a constitutive part of the Soviet Union from its establishment in 1922 to its disintegration in 1991. The back and forth of how the Ukrainian question is treated continues after the Second World War, if in a less violent way. After Chernobyl, when Gorbachev and the Soviet leadership don't say anything about the spread of radioactive material, things start to move in Ukraine. And it's at that moment, the 1970s, that are so important for understanding the present because that's when people like Putin grew up.