Political status of Crimea

The Crimean problem (Russian: Проблема Крыма, romanized: Problyema Kryma; Ukrainian: Кримська проблема, romanized: Krymska problema) or the Crimean question (Russian: Крымский вопрос, romanized: Krymskiy vopros; Ukrainian: питання Криму, romanized: pytannia Krymu) is a dispute over the status of Crimea between Ukraine and Russia. The dispute began during the dissolution of the Soviet Union, but did not escalate into a conflict until the 2014 Ukrainian revolution, when Russian special forces were deployed to occupy Crimea and took over its government buildings.

Source: Wikipedia — Political status of Crimea (CC BY-SA 4.0)