Syria has accused a number of countries backing rebel groups in his country of supporting terrorism.
In a speech to the UN General Assembly, Foreign Minister Walid Muallem singled out the US, France, Turkey, Saudi Arabia and Qatar for criticism.
Calls for President Bashar al-Assad to step down were, he said, “blatant interference” in Syria’s affairs.
Meanwhile, UN Secretary General Ban Ki-moon has urged the Syrian authorities to show compassion to their own people.
After talks with Mr Muallem, Mr Ban “raised in the strongest terms the continued killings, massive destruction, human rights abuses, and aerial and artillery attacks committed by the government,” his spokesman said.
The United States and France along with several regional countries had undermined peace efforts, supplying rebel groups with arms and money, the Syrian foreign minister told the UN.
“Permanent members of the [UN] Security Council who have launched wars under the excuse of combating terrorism [are] now supporting terrorism in my country without any regard to United Nations resolutions.”
Mr Muallem said it was no surprise that the Security Council had failed to condemn rebel bombings as some of its members supported such acts.
Before his speech reports emerged of further bloodshed in Syria.
A UK-based activist group said 18 soldiers were killed in a rebel ambush and 30 people were feared dead in an air strike by Syrian armed forces on the north-western town of Salqin.
An armed forces convoy was ambushed on the main road from Homs to Palmyra in central Syria, according to the Syrian Observatory for Human Rights.
Buses, lorries and cars were targeted by a series of improvised explosive devices (IEDs), it said. A prominent activist organisation reporting incidents in the Syrian conflict, the group says its reports are impartial, although its information cannot be independently verified.
Close to the Turkish border in the north-west, barrel bombs were dropped on the town of Salqin, activist network the Local Co-ordination Committees said.
A number of buildings were hit and unverified footage posted on the internet showed badly burned bodies. Several of the victims were children.
In one video, a man is seen shouting that his son has been killed. In another, the bodies of three children are described as being from the same family.
Days after rebel forces declared they were launching a campaign to drive government forces out of Syria’s second city Aleppo, the battle there is still raging.
Rebels and armed forces were said to be involved in fierce clashes in Aleppo’s famed ancient market or souk.
Hundreds of stalls in the souk have been destroyed by a fire that began on Friday and continued the following day.
Aleppo’s 13th Century citadel and its Old City, complete with a medieval covered market, is one of six Unesco world heritage sites in Syria.
Speaking earlier to Beirut-based TV channel Al-Mayadeen, the Syrian foreign minister accused the United States of “inventing” a problem surrounding his country’s chemical weapons.
Damascus officials have recently acknowledged the existence of a stockpile of chemical weapons and US Defence Secretary Leon Panetta said last week that Washington had some concerns about the security of Syria’s chemical and biological weapons sites.
However, Mr Panetta acknowledged the major sites were secure.
“Talk of chemical weapons in Syria is fabricated by the US administration,” Walid Muallem said.