TY JOUR TI FINANCIAL CRISES: THEORETICAL MODELS, EMPIRICAL RESEARCH AND THE PROBLEM OF FORECASTING KW financial crisis KW banking crisis KW currency crisis KW debt crisis KW economic crisis KW forecasting KW indicators of approaching financial crises JO Bulletin of Economic Security AU ZOLKIN, T.A. PY 2025 IS PB Moscow University of the Ministry of Internal Affairs of Russia named after V.Ya. Kikot