Which country aided Finland in Operation Stella Polaris against the Soviet Union?
Operation Stella Polaris: Operation Stella Polaris was the cover name for activity in which Finnish signals intelligence records, equipment and personnel were transported into Sweden after the ending of the Continuation War in 1944 so that the signals intelligence activities could continue in Sweden and the equipment would not end up in the hands of the Soviet Union. Continuation War:  Germany regarded its operations in the region as part of its overall war efforts on the Eastern Front, and it provided Finland with critical material support and military cooperation.
Germany