The 2023 Pushkin House Book Prize was awarded on Thursday evening to Owen Matthews for his book “Overreach: The Inside Story of Putin’s War Against Ukraine.” Using accounts from current and former Kremlin insiders, testimony of captured Russian soldiers and on-the-ground reporting from Russia and Ukraine, Matthews — a journalist who has been covering Russia and the region for more than a quarter of a century — tracks the sources of the war from its conception and follows the first months of the conflict.