The document summarizes the root causes, key events, and international response to the ongoing Ukraine crisis. It discusses how Russian opposition to Ukraine strengthening ties with the EU led to protests in Ukraine and the ousting of the Ukrainian president in 2014. This prompted Russia to invade and annex Crimea on the basis of protecting Russian citizens. The document outlines international sanctions imposed on Russia and their economic impacts. It also summarizes peace talks in Minsk and the agreements reached to establish ceasefires and decentralize power in eastern Ukraine.