Question: What is the name of this series of mass executions during World War II, which, along with Sambor Ghetto, was anenexed to the Ukranian SSR?
Sentence (from "Łuck Ghetto"): The invading Soviets annexed the city to the Ukrainian SSR in 1939 along with the entire region, an renamed it as Луцьк (Lutsk).
Relevant evidence: No