TY JOUR TI ASSESSMENT OF FOOD SECURITY IN RUSSIA KW food security KW food availability KW foreign trade policy KW food self-sufficiency factors KW import substitution JO Vestnik of Kazan State Agrarian University AU Safiullin, I.N. AU Ziganshin, B.G. AU Amirova, E.. AU Klychova, G.S. AU Nizamutdinov, M.M. PY 2021 IS 16 PB Kazan state agrarian University