Iranian newspapers on Wednesday welcomed a speech by U.S. President Barack Obama for recognizing Washington's "past mistakes", saying a new international mood that favors Tehran has begun.

In remarks before the United Nations General Assembly on Tuesday, Obama pushed for a "diplomatic path" with the new Iranian government.

U.S. Ambassador to Lebanon David Hale highlighted on Wednesday the additional U.S. assistance to Lebanon for both the humanitarian and security challenges that Lebanon faces that was announced by President Barack Obama on Tuesday.

He said after holding talks with caretaker Information Minister Walid al-Daouq: “This aid helps the Lebanese army fulfill its mandate as Lebanon’s sole legitimate defense force and implement outstanding U.N. Security Council resolutions, such as 1701 and 1559.”

The United States offered to set up "an encounter" between President Barack Obama and his new Iranian counterpart during a U.N. summit but it proved "too complicated" for the Iranians, a U.S. official said Tuesday.

Confirming that Obama would not meet with Iranian President Hassan Rowhani in New York, the official said the Iranians informed the U.S. Tuesday that they could not arrange it.

The United States has approved $8.7 million in military assistance focused on increasing the Lebanese Armed Forces’ ability to "monitor, secure, and protect Lebanon’s borders against terrorist threats and the illicit transfer of goods," the White House announced on Tuesday.

The U.S. also donated more than $74 million to help Lebanon cope with the growing refugee crisis.

President Michel Suleiman on Tuesday told U.S. President Barack Obama that “the international community and the United States must offer support in order to secure the success of the meeting of the international support group for Lebanon and to help the country cope with the burden of the Syrian refugee influx," state-run National News Agency reported.

According to NNA, Obama voiced support for Lebanon's sovereignty and independence, lauding Suleiman's “efforts” and reiterating Washington's “rejection of Hizbullah's intervention in Syria.”

Iran said Tuesday there were no plans for a meeting between President Hasan Rowhani and his American counterpart Barack Obama at the U.N. General Assembly.

"Such a meeting is not on the agenda," foreign ministry spokeswoman Marzieh Afkham told reporters when asked about the White House not ruling out the possibility of a landmark encounter in New York.

U.S. President Barack Obama spoke to his Kenyan counterpart Monday and promised him "whatever law enforcement support is necessary" in the wake of an attack on Nairobi shoppers.

Obama's father was Kenyan, but the U.S. leader has largely kept his distance from President Uhuru Kenyatta, who has been named a suspect in an International Criminal Court probe of Kenyan electoral violence.

The White House would not rule out Monday a meeting between U.S. President Barack Obama and Iran's new President Hasan Rowhani on the sidelines of the U.N. General Assembly.

U.S. Secretary of State John Kerry meanwhile will attend a meeting of major powers this week with Iran's Foreign Minister Mohammad Javad Zarif on Tehran's nuclear program, it said.

U.S. President Barack Obama used a memorial service for the victims of America's latest mass shooting on Sunday to make another impassioned appeal to reform gun ownership laws.

"No other advanced nation endures this kind of violence. None," he declared, at a ceremony in the Washington Navy Yard, where a contractor killed 12 people in a gun rampage on Monday.

Iranian President Hassan Rowhani warned the West on Sunday that it will "regret" any military intervention in Syria, and called for dialogue to stop the war in its ally.

"Do not seek a new war in the region because you will regret it," Rowhani said in a remarks at a military parade in Tehran addressed to Western governments who have called for military strikes on Syria.