Which nation was not invaded or occupied by German forces during World War II?

Sweden was neutral during World War II and, as a result, was not invaded or occupied by German forces. Its geographic position and diplomatic strategies allowed it to maintain neutrality throughout the conflict. Unlike Belgium, Norway, and Russia, which experienced German invasions and occupations — with Belgium and Norway facing swift invasions during 1940, and Russia (the Soviet Union) encountering Operation Barbarossa in 1941 — Sweden managed to avoid direct military engagement and occupation by maintaining a policy of neutrality, even though it had to deal with pressures and negotiations from both Axis and Allied powers. This distinction is crucial in understanding the dynamics of World War II and the various experiences of countries involved.