VIENNA (AP) -- Three days of protracted negotiations held under the specter of war highlighted the diplomatic difficulties ahead for nations intent on ensuring that Iran is not developing nuclear weapons.

In a statement Thursday that was less than dramatic, six world powers avoided any bitter criticism of Iran and said diplomacy - not war - is the best way forward.

The cautious wording that emerged from a weeklong meeting of the U.N. nuclear agency reflected more than a decision to tamp down the rhetoric after a steady drumbeat of warnings from Israel that the time was approaching for possible attacks on Iran to disrupt its nuclear program.

Indeed, the language was substantially milder than the tough approach sought by Washington and allies Britain, France and Germany at the International Atomic Energy Agency's 35-nation board meeting. Agreement came only after tough negotiations with Russia and China.