i m erin burnett. out front tonight countdown to nuclear showdown. the rhetoric rising ahead of a make or break moment for iran and the rest of the world. a week from tonight, negotiators will be arriving to talk to iran about the disputed program, a debate about where iran will talk to the united states, britain, france, germany, china and russia may not just be rhetoric. this could be real talk and send the world down a path towards a military strike. now, ron suggested it might move the venue from istanbul to baghdad or beijing. here s what defense secretary cohen told me about this move. the iranians are not interested in reaching any kind of agreement. they are not interested in reducing nuclear power. they re interested in acquiring nuclear weapons. now, iran vehemently says its nuclear program is for peaceful purposes. but it isn t just the united states, which is frustrated by iran to delay or refuse talks. prime minister stepped into it today saying iran s offe