German Foreign Minister Guido Westerwelle welcomed a "new tone" from Tehran during a meeting with his Iranian counterpart Mohammad Javad Zarif on Tuesday in New York.
Israeli Prime Minister Benjamin Netanyahu early Wednesday blasted Iranian President Hassan Rowhani for making what he described as a "cynical speech that was full of hypocrisy" at the UN General Assembly.
In a diplomatic breakthrough, the foreign ministers of arch rivals, the US and Iran, will hold their first talks on Tehran's contested nuclear drive at a landmark meeting.
Iranian President Hassan Rowhani said Thursday his government was ready to "help facilitate dialogue" between the Syrian government and the opposition.
After a flurry of diplomatic smoke signals, Iran and the United States are sizing up the gamble of a presidential close encounter at the UN next week that could open a first crack in 30 years of enmity.
Israeli Prime Minister Benjamin Netanyahu will visit the White House on September 30 to consult President Barack Obama on Iran's nuclear challenge, Syria and Palestinian peace talks.
Iran is expected to enjoy a rare let-up in pressure at a UN atomic agency meeting starting Monday, as Tehran's new government and world powers prepare a fresh diplomatic push.
Iran is carefully watching the divisive US debate on whether to launch military strikes against its chief ally, Syria, but the Obama administration may be at risk of sending Tehran the wrong message.
Clashes and explosions were reported in a camp housing Iranian exiles, with the group claiming Iraqi troops killed more than 50 of their members, charges officials steadfastly denied.
A senior Iranian official warned in Damascus on Sunday that US interests in the region would be at risk if Washington launched a military strike against his country's ally Syria.
US Secretary of State John Kerry on Wednesday called for the release of two American dual citizens jailed in Iran, saying Washington was "deeply concerned" about their fate.
Iranian President Hassan Rowhani on Saturday pointed to the use of chemical weapons in Syria, three days they allegedly killed hundreds of people in attacks near Damascus.
New Delhi and Tehran were Saturday working to resolve a dispute over the detention of an Indian oil tanker by Iranian naval guards for allegedly polluting sea waters in the Persian Gulf.
President Hassan Rowhani said Tuesday Iran was ready for "serious" talks on its nuclear programme without delay and that US calls for tougher sanctions showed a lack of understanding.