This volume contains the proceedings of two Russianconferences on logic programming, held in 1990 in Irkutskand in 1991 in St. Petersburg. The aim of the conferenceswas to bring together researchers from the Russian and theinternational logic programming communities. Topics coveredin the volume include: logic programming, automated theoremproving, non-monotonic reasoning, applications ofmathematical logic to computer science, deductivedatabases,implementation of declarative concepts, and programming innon-classical logics.This is the first volume to represent activity in the fieldof logic programming in the countries of the former SovietUnion.