Tuhia he haere tonu mō tēnei wāhanga - E rua ngā whanaketanga i āwhina ki te huri i te ōhanga o Iharaira mai i te tīmatanga o te tekau tau 1990. Ko te tuatahi ko ngā ngaru o te hekenga mai o ngā Hurai, mai i ngā whenua o te USSR o mua, kua kawea mai e ia neke atu i te kotahi miriona tāngata hou ki Īharaira. Ko ēnei manene Hurai hōu o te Soviet, he tokomaha o rātau he tino mātauranga, he puna o te mātauranga pūtaiao me te hangarau hei āwhina ki te whakatenatena i te rāngai hangarau e tipu haere ana o Iharaira, inaianei ko te 15% o te taupori o Iharaira. Ko te whanaketanga tuarua e whai hua ana ki te ohanga o Iharaira ko te tukanga rangimarie i timata i te huihuinga o Madrid
o Oketopa 1991, nā reira i hainatia ai ngā whakaaetanga, ā, i muri mai he tiriti rangimarie i waenganui i a Iharaira me Horano (1994).