The Crisis in Ukraine—2014
Journal: Oxford University Press eBooks
Year: 2018

Abstract On 28 February 2014, Russian forces moved out of their base on the Black Sea into Crimea, triggering a crisis with Ukraine that quickly spread to Eastern Ukraine. Russia has attempted to justify its actions in Ukraine. On close analysis, no argument is adequate to avoid the charge of aggression, which is any serious violation of United Nations Charter Article 2(4). Article 2(4) is no mere treaty rule. It is jus cogens, a peremptory norm, meaning it is durable, impervious to modification