00644naa#a2200181#i#450# EN\RIOR\bibl\72951 20240518095829.6 2409-6024 20231230b2023####ek#y0engy0150####ca RU On the main trends in improving the pension system of the Russian Federation Journal article Moscow Publishing Center RIOR 2023 11 с. Journal article local Социальное страхование и социальное обеспечение. 369 Kulumbegova Lana Valer'evna Milenkov Aleksandr Vladimirovich riorpub.com