The children were removed from their parents in 2011, when one of the boys told a nursery teacher that his father had "groped inside his pyjama". No charges have been brought against the father and Norwegian police are dropping the investigation. The couple has since divorced and the children's mother, Eva Michalakova, is currently seeking custody of her children. She denies that the kids were abused.
"The case of Ms Michalakova resonates strongly among the Czech public and undermines long-term Czech-Norwegian relations and the hitherto flawless image of Norway in the Czech Republic. Ms Michalakova enjoys mass support among Czech citizens and, as a father with a family, her fate does not leave me indifferent," Zeman said in a letter.
The story comes three months after Zeman compared the Norwegian foster care system to the Nazi Lebensborn program, which was aimed to raise the birth rate of "Aryan" children in Nazi Germany.
Zeman also accused the foster care services of acting 'like Nazis' by not allowing Michalakova to talk to her children in Czech.
This isn't the first time the Norwegian foster care system grabbed international headlines. In 2012, two Indian toddlers were taken into foster care because they were allegedly eating with their hands.
In April 2015, a Lithuanian talk show accused Norway of stealing Lithuanian children in an attempt to tackle 'the highest rate of inbreeding in the world'.
Earlier, Lithuania's Gražina Leščinskiene made headlines after her 7-year-old son was taken into care by Norway's Child Protection Service. She claimed that he had been taken from her after he allegedly displayed so-called 'sexualized behavior', including frequent visits to the toilet and sniffing his hands.