TY JOUR TI DIGITALIZATION OF AGRI-FOOD SYSTEMS AS A FACTOR OF SUSTAINABILITY OF THE RUSSIAN REGIONAL ECONOMY KW digitalization KW agri-food chains KW regional economy KW food security KW transaction costs KW institutional modernization KW investment attractiveness KW agricultural sector KW digital platforms JO Russian Journal of Management AU Mottaeva, A.B. PY 2026 IS 14 PB Publishing Center RIOR