After 18 years in prison, the man who exposed Israel's nuclear weapons program to the world, Mordechai Vanunu, remains restricted under obsolete principles contradicting the UN Charter on Human Rights, prominent whistleblower Daniel Ellsberg told Russia Today.

Calling Vanunu a "preeminent prophet of the nuclear era," Ellsberg stressed that Israel must recognize, for its own good, what Vanunu did was right and come clean about the existence of its nuclear weapons program. The Israeli government should also stop lying to its own people and the world and admit that they were the first to introduce nuclear weapons to the Middle East, he added.

Ellsberg, who exposed the Pentagon Papers on the Vietnam War to the American media in 1971 and was prosecuted and branded a "traitor" by some for his move, also talked about Vanunu's ordeal from the perspective of a whistleblower.

RT:Ten years since his release, Vanunu is still under constant government pressure, is in constant fear of arrest. Why is that happening, do you think?