<p>The article is devoted to the research of sustainable development of northern (arctic) one-industry urban settlements. The author provides an assessment of state support for Russian monocities in the modern conditions and identifies specifics of the functioning of northern (arctic) monocities, which require a special approach to supportive measures for their development. The paper considers the method of diversification of a city-forming enterprise in strategic documents of multi-profile settlements. It is noted that such an approach does not provide a systematic management of the socio-ecological and economic processes of singleindustry towns. The strategy does not take into account the environmental factor, which does not solve the accumulated environmental problems in the Russian Arctic. The current study stresses the necessity of an integrative (cumulative) assessment of the environmental impact resulting from mining operations, which will allow for measuring and managing socioecological and economic processes. The author proposes an integration model of strategic management based on cumulative impact assessment at the regional level.</p>