".. We have an interest in counterbalancing the advantages Iran has gained in the rest of the region.."

"... As American officials confront the upheaval in Syria, a country with which the United States has icy relations, they say they are pulled between fears that its problems could destabilize neighbors like Lebanon and Israel, and the hope that it could weaken one of Iran’s key allies....

Officials fear the unrest there and in Jordan could leave Israel further isolated. The Israeli government was already rattled by the overthrow of Egypt’s leader, Hosni Mubarak, worrying that a new government might not be as committed to Egypt’s 1979 peace treaty with Israel. ...The United States does not believe Jordan is close to a tipping point, this official said. But the clashes, which left one person dead and more than a hundred wounded, pose the gravest challenge yet to King Abdullah II, a close American ally.

Syria, however, is the more urgent crisis — one that could pose a thorny dilemma for the administration if Mr. Assad carries out a crackdown like that of his father and predecessor, Hafez al-Assad, who ordered a bombardment in 1982 that killed at least 10,000 people in the northern city of Hama. Having intervened in Libya to prevent a wholesale slaughter in Benghazi, some analysts asked, how could the administration not do the same in Syria?

Though no one is yet talking about a no-fly zone over Syria, Obama administration officials acknowledge the parallels to Col. Muammar el-Qaddafi. Some analysts predicted the administration would be cautious in pressing Mr. Assad, not because of any allegiance to him but out of a fear of what could follow him — a Sunni-led government potentially more radical and Islamist than his Alawite minority regime.......

Other analysts, however, point to a positive effect of the unrest: it could deprive Iran of a reliable ally in extending its influence over Lebanon, Hezbollah and the Palestinians in the West Bank and Gaza. That is not a small thing, they said, given that Iran is likely to benefit from the fall of Mr. Mubarak in Egypt, the upheaval in Bahrain, and the resulting chill between the United States and Saudi Arabia. "There’s much more upside than downside for the U.S.,” said Martin S. Indyk, the vice president for foreign policy at the Brookings Institution. “We have an interest in counterbalancing the advantages Iran has gained in the rest of the region. That makes it an unusual confluence of our values and interests.”