TY JOUR TI Cryptocurrencies: opportunities and prospects KW cryptocurrency KW sanctions KW state control KW international settlements KW foreign trade restrictions KW commission costs KW tax base KW investment opportunities KW government regulation JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Apal'kov, D.G. AU Shamarov, V.A. PY 2025 IS 0 PB ITBO University