Undefined citizenship is a term used in Estonia to denote statelessness. It is applied to those migrants from former Soviet republics and their children, who were unable or unwilling to pursue any country's citizenship after the collapse of the Soviet Union. Russia being a successor state to the Soviet Union, all former USSR citizens qualified for natural-born citizenship of Russian Federation, available upon mere request, as provided by the law âOn the RSFSR Citizenshipâ in force up to end of 2000.. Estonia's policy of requiring naturalisation of post-war immigrants was in part influenced by Russia's citizenship law and the desire to prevent dual citizenship.
Stateless persons who reside legally in Estonia can apply for an alien's passport. Estonian alien's passport allows free travel in Schengen treaty countries.