In 1991 the dissolution of the USSR led to the independence of 15 nations including Ukraine, Belarus, Estonia, Latvia, Lithuania and Moldova
The expansion of the EU and NATO has led Russia to be concerned about its influence in the region
Russia's concerns about Ukraine and Georgia stating their aspirations to join NATO and Ukraine and Moldova wanting to join the EU escalated tensions in the area
In 2014 Russia annexed Crimea an area of Ukraine
Tensions culminated with the invasion of Ukraine by Russia in 2022 and the ongoing conflict