The Bulletin of the Atomic Scientists has just issued its 2023 Doomsday Clock statement, calling this "a time of unprecedented danger." It has advanced the hands of the clock to 90 seconds to midnight, meaning that the world is closer to global catastrophe than ever before, mainly because the conflict in Ukraine has gravely increased the risk of nuclear war. This scientific assessment should wake up the world’s leaders to the urgent necessity of bringing the parties involved in the Ukraine war to the peace table.