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a movie describe a German soldier fled Siberia camp and returned to Germany after 20 years
"As Far as My Feet Will Carry Me" (2001) is a film that closely matches your description. It depicts the true story of a German army officer, Clemens Forell (portrayed by Bernhard Bettermann), who is captured by the Soviets during World War II and sent to a labor camp in Siberia. After enduring five years of immense hardship in the camp, Forell escapes and embarks on an incredible, arduous journey across thousands of miles to return to Germany.
The film chronicles his harrowing trek through the harsh Siberian wilderness, facing numerous dangers and obstacles along the way, until he finally makes it back home after an absence of over 20 years"