Question: Which operation was this military offensive, which put an end to the conflicts between Lithuanian and Polish units known as Dubingiai massacre, a part of?
Sentence (from "Dubingiai massacre"): In total, 70–100 Lithuanians were killed by the end of June 1944 in Dubingiai and the neighbouring villages of Joniškis, Inturkė, Bijutiškis, and Giedraičiai.
Relevant evidence: No