As the Soviet army occupied Latvia in 1940, Kviesis was prohibited to practice law and put under house arrest.
Kalniņš returned to Latvia in 1940 following the Soviet occupation, initially serving as a political officer of the "Latvian People's Army" in the run-up to the armed forces' full incorporation into the Red Army.
During the Soviet occupation of Latvia, the interior of the castle was heavily reconstructed and today Jaunpils castle has typical Soviet interiors from the 1960s.
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He acquired Latvian citizenship, and went about seeking to regain some of the family's properties lost during the Soviet occupation of Latvia.
Occupation of the Latvian Republic Day, to recall the Soviet occupation of Latvia in 1940