TY JOUR TI DEFINITION OF «SECURITY» AS AN OBJECT OF THEORETICAL AND LEGAL UNDERSTANDING KW security KW national security KW theory of law KW legal definition KW legal uncertainty KW strategic planning documents KW balance of constitutional values KW restriction of rights and freedoms KW threats to security KW countering terrorism JO LAW. SAFETY. EMERGENCY SITUATIONS AU Gusaim, I.V. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia