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The Russian foreign ministry has expressed its regret that Iran, Saudi Arabia, Jordan and Lebanon have not been invited to join an Action Group on Syria.
The group is due to meet in Geneva on Saturday to discuss how to bring about a Syrian-led political transition.
The UN envoy to Syria Kofi Annan has said he is "optimistic" that the meeting of world leaders in Geneva on Saturday will produce an acceptable outcome.
Mr Annan's spokesman Ahmad Fawzi told Reuters TV that "talks are on course" and a preparatory meeting will be held in Geneva on Friday.
Syria's president Bashar Al-Assad has said that the Government has to eliminate terrorists to save thousands of lives.
Speaking to Iranian television, he also said a solution imposed on Syria from outside was unacceptable because only Syrians could resolve the country's crisis.
"No non-Syrian model is acceptable because no one but us knows how to solve the problem," Assad said during the rare hour-long interview.
The president said that some countries want the Kofi Annan peace plan to fail in order to blame Syria.
Syrian President, Bashar Al-Assad told Iranian state television that Syria is under pressure because of its support for Palestine, according to Reuters news agency.
The president said the country is moving forward with reforms but they have no meaning for terrorists and governments that support them.
It is the second time in a week that the ICRC has been forced to turn back to Damascus. On June 21st, its joint team with the Syrian Arab Red Crescent heard shooting as it tried to enter the old city where the agency says hundreds of civilians are trapped by fighting.
ICRC spokesman Bijan Farnoudi in Geneva declined to provide specifics or apportion blame for the latest setback after the two sides agreed in principle to a humanitarian truce. In a statement the agency said:
"The ICRC and the Syrian Arab Red Crescent are virtually the only humanitarian organisations working in the hardest-hit areas in the country, and safe and unhindered access is thus essential to their work. ICRC and Syrian Arab Red Crescent teams take considerable risks performing their tasks,"
Turkey's National Security Council said it would respond to Syria's "hostile" downing of one of its reconnaissance jets last week with determination but within international law.
The council, made up of the president, senior ministers and military chiefs, said in a statement after a five-hour meeting:
Efforts to evacuate civilians and wounded from the battered Syrian city of Homs failed again when a rescue team could not enter affected areas, the International Committee of the Red Cross (ICRC) has said.
Beatrice Megevand-Roggo, head of ICRC operations for the Near and Middle East, said in a statement that there had been an agreement from Syrian authorities and the opposition for the ICRC team to carry out an evacuation.
But "on the spot, however, agreed-upon conditions were not met and the staff were unable to proceed", she said.
Latest ITV News reports
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