Pollard, 61, had been serving a life sentence, but was granted parole this year under sentencing rules in place at the time of his prosecution that made him presumptively eligible for release this month.

Although the decision from the U.S. Parole Commission came around the same time as a sharp disagreement between the U.S. and the Israeli governments over a nuclear deal with Iran, officials from both countries have denied the release was in any way tied to that arrangement, or was intended as a concession to Israel.

The release, scheduled for next Friday, caps a case that divided public opinion in Israel and America and has been a periodic source of legal and diplomatic wrangling between the two countries.

"In terms of the quantity of stuff he gave away and the classification and the damage to relations, it certainly was a significant case," said Jeffrey Richelson, a senior fellow at the National Security Archive at George Washington University who has written on Pollard.