TY JOUR TI Differentiated implementation mechanisms oil and gas potential of coastal regions the Russian sector of the Caspian sea KW Caspian Sea KW oil and gas potential KW regional development KW mechanisms for realizing potential KW differentiated approach KW Astrakhan region KW Republic of Dagestan KW Republic of Kalmykia KW LUKOIL KW development stages KW public-private partnership JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Gitman, I.S. PY 2026 IS 0 PB ITBO University