U.N. nuclear inspectors will press Iran this week for a long-sought green light to visit a key military site, although suspected clean-up work may make it difficult to find evidence of any illicit atomic bomb research there, Reuters reported Monday, December 10. Western diplomats are not optimistic about the chances of a breakthrough in the new discussions in Tehran, after a series of meetings between Iran and the International Atomic Energy Agency (IAEA) this year failed to make headway. The U.N. nuclear watchdog wants Iran to allow its inspectors to visit sites, interview officials and study documents as part of an IAEA investigation – largely stymied by Iranian stonewalling for four years – into possible military dimensions to the country’s nuclear program. The IAEA’s priority is to examine the Parchin military complex southeast of Tehran, where it believes Iran has carried out explosives tests with nuclear applications.