Annexation
Annexation,[1] in international law, is the forcible acquisition and assertion of legal title over one state's territory by another state, usually following military occupation of the territory.[2] In current international law, it is generally held to be an illegal act.[3] Annexation is a unilateral act where territory is seized and held by one state,[4] as distinct from the complete conquest of another country,[a][7][8] and differs from cession, in which territory is given or sold through treaty.
This article is about the incorporation of additional territory into a nation state. For the incorporation of additional territory into an urban area, see Municipal annexation.
Annexation can be legitimized if generally recognized by other states and international bodies.[4][9][2]
The illegality of annexation means that states carrying out such acts usually avoid using the word annexation in describing their actions;[10][11] in each of the unresolved annexations by Israel, Morocco and Russia, the states have avoided characterizing their actions as such.[11][12]