A Caspian Airlines plane crashed in Iran shortly after taking off from Tehran, killing all 168 people on board.

里海航空公司一客机在伊朗德黑兰刚起飞不久坠毁，机上168人全部遇难，无一生还。

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Livni took a much tougher line on Iran, saying Israel and the international community need to confront Tehran and not appease it.

利夫尼对伊朗则采取了比较强硬的态度。她说，以色列和国际社会需要对抗德黑兰，而不是安抚德黑兰。

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Nightmare scenarios are dangerous for yet another reason: the expected consequences of a nuclear Iran, real or imagined, will determine the policies pursued to prevent Tehran from developing the bomb.

恶梦般的情景很危险的另外一个原因是：备受期望的拥有核武器的伊朗下场，不管是真的还是只是想象，都将决定防止德黑兰引爆核武器的政策。

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The Obama administration came into office offering outreach to Tehran, including a direct U.S.role in big-power contacts with Iran on its nuclear program.

VOA: standard.2009.06.24

The plan calls for Iran to send uranium abroad for enrichment, but Tehran countered with conditions to what was presented as a take-it-or-leave-it proposition.

VOA: standard.2009.11.15

U.S.officials say Iran's uranium enrichment program is weapons-related, despite Tehran's expression of peaceful intent.

VOA: standard.2010.05.14

In his assessment of the stand-off between Iran and Western powers over its nuclear programme - which Tehran argues is for peaceful and civilian purposes - Mr Kissinger called for "serious" negotiations on both sides to look for solutions.

BBC: Henry Kissinger

Many of the signers of the Hagel letter also appeared in another open letter to Mr Obama - this one on Iran - published that same day, further bringing to light Tehran's centrality in these debates.

BBC: Iran once again at centre of US divide

Officials at the Swiss Embassy -- which represents the U.S. interests in Iran because Washington and Tehran do not have formal relations -- said earlier this week they had spoken to Iranian officials.

CNN: Iraqi foreign minister asks Iran about detained hikers