The foreign minister of the United Arab Emirates, Abdullah bin Zayed Al Nahyan, expressed to Clinton a concern among Persian Gulf nations that Obama might make a deal with Iran without full consultation with US allies. Clinton expressed doubt that Iran would respond to the Obama administration's expressions of interest in engaging Teheran, and said that Iran's "worst nightmare" is an international community united against Iranian nuclear ambitions, the US official said.

President Obama sent a secret letter to Russian President Dmitri A. Medvedev last month suggesting that he would back off deploying a new missile defense system in Eastern Europe if Moscow would help stop Iran from developing long-range weapons, American officials said Monday.