TY JOUR TI Population concentration in cities and urban agglomerations as a negative trend of spatial development of the Russian Federation in the context of ensuring economic security of the state KW spatial development of the Russian Federation KW economic security of the state KW negative trends KW small and medium-sized cities KW rural areas JO Russian Journal of Management AU Oganyan, V.A. PY 2026 IS 14 PB Publishing Center RIOR