Iranian-born immigrants to Israel are drafted to its military intelligence units in disproportionately large numbers, an official report said on Thursday, reflecting high demand for Farsi speakers to monitor the Jewish state’s arch-enemy.

Israeli Prime Minister Benjamin Netanyahu sees a mortal menace in Iran’s disputed nuclear program and has long hinted his country was waging a covert campaign to track and foil it.

Those efforts, security sources say, have been stepped up since world powers and Tehran agreed an interim nuclear deal in November. Netanyahu condemned the accord as cover for Iran to pursue projects with bomb-making potential.