Former IDF soldier Anat Kam, who was convicted of serious espionage, petitioned the Supreme Court on Wednesday against her 4.5-year prison sentence.
A request was also submitted to defer her sentence until a decision is made on the petition.
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Kam was convicted of illegally possessing thousands of classified IDF documents and passing them on to Haaretz reporter Uri Blau without authorization. She copied the documents onto a CD during her military services and kept them in her home.
The 50-page petition claims that the Tel Aviv District Court seriously deviated from the acceptable punishment in similar cases.
Kam's defense counsel wrote in the petition that the court failed to consider the fact that she had expressed her full and sincere regret and did not even mention it in the sentence.
According to Kam's lawyer, she has no intention of harming the State's security and handed the material to a journalist subject to censorship rules in an "act of foolishness".
"The court failed to properly take into account the fact that Kam was placed under house arrest for two years," the appeal claimed.
Kam also asked the court to defer her sentence, which she is slated to begin serving on Sunday. Justice Miriam Naor is expected to discuss the request on Thursday.