The article presentsthe historical and legal aspects ofthe Ukrainian crisis inthe context ofthe development ofmodern international law. The events in Ukraine in 2014–2024 actualized many institutions of modern international law: the hierarchy of principles of territorial integrity of states and the right of peoples to self-determination, the problem of secession and the role of referendums in the creation of new independent states, the issue of their recognition in the international arena and the protection of compatriots abroad.
