Russian Foreign Minister Sergei Lavrov said the raid was a "very unsafe development".
"At least 14 fighters were killed in the strike on the T-4 airport, among them Iranian forces", said the Syrian Observatory for Human Rights, a Britain-based war monitor.
Tehran, which usually remains mum about Israeli strikes harming its assets in Syria, acknowledged - through its semi-official media outlets - that Iranians were killed by Israel's warplanes, and vowed revenge. Israel viewed that and all other Iranian military forces in Syria as an unacceptable threat to the security fo the Jewish state. Russian Federation and Syria have bluntly claimed that Israel was behind the attack. While Assad and his allies deny perpetrating chemical weapons attacks, the global community continues to collect damning evidence.
Iran is a key ally of the Syrian government, alongside Russian Federation, and Velayati was speaking on arrival in Damascus where he was due to meet with President Bashar al-Assad, according to ISNA.
"We will stand by Syria's government against any foreign aggression". Given the heightened tensions between Russia and the United States on other issues, Russian President Vladimir Putin may seize on USA strikes as an opportunity to leverage a confrontation and force the United States to the negotiating table, said Vladimir Frolov. "Big price to pay", he said.
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The Syrian conflict began when the Baath regime, in power since 1963 and led by Assad, responded with military force to peaceful protests demanding democratic reforms during the Arab Spring wave of uprisings, triggering an armed rebellion fuelled by mass defections from the Syrian army.
Damascus and its allies have denounced the accusations, the government brushing them off as an "unconvincing broken record".
The Eastern Ghouta area has been under rebel control for the past six years and completely surrounded by the government for almost five years, making it impossible to independently verify the accounts of a chemical attack.
"The allegations from Tehran and Moscow that Israel carried out the aerial bombing and caused serious damage to the Iranian target raises the likelihood of a deterioration in the military situation between Iran and Israel", assessed Shapira, who served as military secretary to Netanyahu during his first term.
This assault comes after a chemical weapon attack on civilians in Damascus' rebel-held suburb of Duma. "The possible theaters for doing so are Syria, Lebanon, or anywhere else around the globe, and Iran may employ its characteristic use of terror proxies".
Syria has been accused multiple times of using toxic weapons including sarin gas in the country's seven-year war, which has killed more than 350,000 people.
The Organisation for the Prohibition of Chemical Weapons "made a preliminary analysis of the reports of the alleged use of chemical weapons immediately after they were issued", said director general Ahmet Uzumcu.