TY JOUR TI International terrorism as a key threat to security in the XXI-st century KW international terrorism KW Islamic terrorism KW migration crisis in Europe KW global and regional security KW strengthening of peace and security KW contemporary challenges and threats JO Bulletin of the Kazan Law Institute of MIA Russia AU Andreev, M.. PY 2018 IS 9 PB Kazan law institute Ministry of Internal Affairs Russian Federation