VIENNA (Reuters) - Western strategists have long debated the spectre of Iran "breaking out" - suddenly showing the ability to explode an atom bomb. But some see a "sneak-out" less visible to U.N. inspectors as a possibly bigger risk and world powers have calibrated their demands in negotiations with Iran to forestall any such outcome.
Under a "sneak-out" scenario, Western officials and experts say, Iran could build a uranium enrichment plant in secret to make bomb material unbeknownst to the U.N. nuclear watchdog, now empowered to visit only Tehran's declared nuclear sites.