A new book by an Israeli journalist is generating a lot of discussion about Iran's quest for nuclear weapons, and U.S. and Israeli attempts to block them.

Eli Lake in the New York Sun today cites examples in Ronen Bergman's The Secret War with Iran of how Western sabotage efforts have slowed, but not stopped, Iran's progress.

For example, "specialized computers sold to Iran for its nuclear laboratories contained viruses that sabotaged the code," Lake writes. He also cites a series of mysterious explosions and plane crashes killing key players in the Iranian program.

It's an updated English translation of Bergman's book, The Point of No Return, which

was Israel's best selling non-fiction book last year.

Still, Jerusalem Post editor David Horovitz writes that Iran is moving forward, and set up its reactors in a way that makes it difficult for a military strike to succeed:

"The latest information, according to Bergman's Mossad sources, is that some 3,000 centrifuges, in 18 cascades, are now enriching uranium, ‘under great technical difficulties,' at Natanz. Nearby, the Iranians are building a plant to hold another 30,000 to 50,000 centrifuges - and building it underground to ensure no repeat of Israel's successful raid on Saddam Hussein's nuclear reactor at Osirak. Already, Natanz is protected by no fewer than 26 anti-aircraft missile batteries, and this and other of its nuclear facilities, he writes (despite others' claims to the contrary), already have the advanced Russian-made S-300 missiles among their defenses."

Despite the successes, Horovitz sums up the situation in his article's headline: "A losing battle, so far."