TY JOUR TI SPECIALLY PROTECTED NATURE RESERVES OF RUSSIA: ANALYSIS OF CHANGES IN LEGISLATION ON SPECIALLY PROTECTED NATURAL TERRITORIES IN THE PERIOD 1991-2024 KW specially protected natural territories; environmental challenges; protection; environment; conservation of biodiversity; nature conservation significance; nature reserve fund; threat of extinction; natural complexes JO Bulletin of the Kazan Law Institute of MIA Russia AU Georgieva, P.A. PY 2025 IS PB Kazan law institute Ministry of Internal Affairs Russian Federation