title: Lessons Learned from the 2014 Russia-Ukraine War and Major Doctrinal Changes in the U.S. Army
abstract: Russia's annexation of Crimea in 2014 without a major battle had a major political and military shock to the West. At this time, the method of warfare applied by Russia was called in the West by various terms such as 'New Generation Warfare', 'Hybrid Warfare', 'Cognitive Warfare', and 'Information Warfare'. Meanwhile, research to respond to this has been actively conducted and is still ongoing. Our military must also study the lessons of the Russia-Ukraine war and prepare for future wars. But ho