On May 18, the US-led coalition struck the pro-Assad fighters near the town of al-Tanf in the area of an established deconfliction zone with Russia.
Jaafari told reporters in Geneva that he had raised the issue of the "act of aggression" on the US' part in talks with UN mediator Staffan de Mistura.
"We discussed the massacre that the US aggressor committed yesterday in our country. This subject was widely discussed," Jaafari said. "The important thing is that our political ambition is higher because we want to focus on fighting terrorism represented by armed groups and the state and government terrorism happening against our country. This includes the American aggression, French aggression and British aggression."
The airstrike was not the first time the US-led coalition intentionally or accidentally struck the Syrian army. In the early hours of April 7, the United States launched 59 Tomahawk cruise missiles at the Syrian military airfield in Ash Sha'irat, located about 40 kilometers from the city of Homs. Moreover, on September 17, 2016, US-led coalition aircraft carried out four strikes against the Syrian army near the Deir ez-Zor airport, killing 62 soldiers and wounding some 100.