This article examines the process of national identity formation among ethnic minorities in the Crimea - specifically, how a new common identity develops in the system of existing identities, what meaning group identities have for different minorities group and how this process influences attitudes and stereotypes toward the ingroup and outgroup. Based on surveys in the Crimea, results show that formation of a common national and regional identity leads to developing of positive stereotypes toward members of other groups, who now are involved in a new group identity, but also is connected with formation of negative attitudes and stereotypes toward other groups. The meaning of identity depends on its position in the system of identities and can be used as a criterion for early warning of conflicts.