When in December 1991, the Soviet Union collapsed, the Russia was arguably recognized as the legal successor state of the Soviet Union and maintained the USSR's position on the UNSC. (politics.stackexchange.com)
Volyn was once part of Kievan Rus before becoming an independent local principality and an integral part of the Halych - Volynia, one of Kievan Rus successor states. (loveme2day.com)
Successor states of the old Soviet Union are trying to fill the vacuum left by the demise of the Soviet academy of sciences. (newscientist.com)