Biden warns Israel off any attack on Iran

But U.S. views are important to the Israelis. Steven J. Rosen, a former policy director of the American Israel Public Affairs Committee, an influential lobbying group, said a decision by Israel to attack Iran's nuclear facilities "depends to a large extent on the impact such a strike might have on the United States." He made the comment in a blog, the Obama Mideast Monitor.

Many top officials in the Obama administration have said they believe the costs of a U.S. attack on Iran would outweigh any benefits, and they are considered less likely to favor military action than the Bush administration.

One hint of the Obama administration's intentions may lie in its choice of top experts.

Richard C. Holbrooke, the administration's representative to Afghanistan and Pakistan, has hired longtime Iran expert Vali Nasr. Dennis Ross, senior administration advisor for Southwest Asia, has hired Ray Takeyh, another veteran Iran expert.

Both Nasr and Takeyh have advocated diplomatic engagement with Tehran.

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paul.richter@latimes.com