"Lavrov said the United States attack was an act of aggression aimed at undermining the peace process, asking the United States not to repeat such mistakes". Iran's Mohammad Javad Zarif emphasized that the participants agreed that unilateral actions by the US were unacceptable.
The trio said that the probe should be carried out by a well-balanced team of experts under the auspices of the Organisation for the Prohibition of Chemical Weapons (OPCW), the United Nations chemical weapons watchdog, reported Xinhua news agency.
"We insist that the U.S. and its allies should respect the sovereignty of Syria and abstain from similar actions", he said.
The recent US military intervention in Syria will have no impact on the Astana talks and Iran, Russia, and Turkey carry on with their agenda to find a political solution to the Syrian war, Iran's Foreign Ministry said. Waild al-Muallem, the foreign minister of Syria, stated that the meeting gave a "strong message" to Washington if they intervene. Syria said the USA manufactured the chemical attack as an excuse to attack.
Other world powers have also condemned Assad for the April 4 attack - although Syrian ally Russian Federation continues to maintain there is insufficient evidence Assad carried out the attack. "Such acts of aggression are obviously meant to derail the peace process, which was endorsed in a unanimously adopted resolution of the U.N. Security Council and implies that the fate of Syria would be decided only by the Syrian people", he said.
"The investigation into this high-profile incident must be transparent and leave no doubt that someone is trying to hide something".More news: BC party leaders take election campaign to annual Sikh celebration
Following Donald Trump's "animal" remark for Syrian President Bashar Assad in the wake of the Idlib chemical attack, Syria's senior diplomat has come down heavily on the US President.
Lavrov said Moscow has asked Washington about the objective of the buildup and received assurances that the USA troops were deployed there to cut supply lines between the Islamic State group factions in Syria and Iraq.
"We will keep monitoring the issue, since the only possible reason for using military force on the territory of Syria is to fight terrorism", he said.
He also demanded a broader investigation into the chemical weapon attack with officials from a variety of countries and called into question the current protocols for investigating such an attack in an unbiased manner.
Russian Federation and Iran are the firmest allies of Assad's regime and have deployed forces to the war-torn country to back him in the country's brutal six-year conflict. It has conducted an air campaign in Syria since September 2015, saving Assad from imminent collapse and helping reverse military fortunes.