TY JOUR TI Analysis of the problems of existing social security systems for police officers in the US, EU countries, the UK and China: comparative legal research and judicial practice KW social security KW social welfare KW police officers KW protection KW personnel management JO BULLETIN OF ECONOMIC SECURITY AU Vnukova, D.R. AU Trishkina, E.A. PY 2026 IS 0 PB Moscow University of the Ministry of Internal Affairs of Russia named after V.Ya. Kikot