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Coding decisions on state forces, fatality counts, and more Published on: | Last updated:  Background Prior to the invasion, trench warfare between the Ukrainian armed forces and Russian-led separatists was limited to parts of the Donetsk and Luhansk regions (also collectively known as the Donbas) after a hot war in the wake of the Euromaidan protest movement in Ukraine in 2013-14, which Russia had framed as a Western-inspired coup d’état and used as a pretext to annex Crimea in March 2014.…