In response, the U.S. Central Command issued its own statement, saying the Syrian aircraft was shot down "in collective self-defense of coalition-partnered forces".
The latest incident occurred in a part of Syria seen as strategically important for the Syrian government and Iran as Tehran seeks to secure a land corridor between forces it backs in Syria and Iraq.
In an indirect reference to Iranian-backed forces that have been gathering in the eastern desert region, a US-led coalition statement cited a recent escalation of tensions and said it would not "tolerate any hostile intent and action of pro-regime forces".
On Sunday evening, a Syrian regime SU-22 fighter dropped bombs near USA -backed Syrian Democratic Forces fighters south of Tabqah in Syria and, in accordance with rules of engagement, was immediately shot down by a U.S. F/A-18E Super Hornet.
The Syrian Democratic Forces (SDF), which include Arab and Kurdish fighters and are supported with air strikes by a US -led coalition, began an offensive two weeks ago to seize the northern city from Islamic State, which overran it in 2014.
The U.S. military has established a roughly 50-kilometer "deconfliction" ring around Tanf, warning the pro-Assad Iranian-backed forces through a Russian deconfliction channel that movement within the zone could be considered hostile.
The United States is aggressively backing the SDF, a Syrian rebel alliance, as it fights its way into Raqqa, supported by intense coalition airstrikes.
"The US position militarily is weaker and any sign of a lack of unity within the worldwide anti-ISIS coalition can only be good news for Russian Federation and the Syrian regime".
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In light of that the coalition announced that it would re-position its aircraft flying over Syria as a prudent measure. The Iranian drone that was shot down Tuesday was outside the deconfliction area, the official said. Russian Federation condemned the US action and in retaliation suspended a hotline meant to prevent such incidents.
On Monday, Russia said that any aircraft from the US-led coalition west of the Euphrates river in Syria would be viewed as potential targets, and would be tracked with missile systems. "ADF personnel are closely monitoring the air situation in Syria and a decision on the resumption of ADF air operations in Syria will be made in due course".
Moscow, which has condemned the American step, said it was immediately pulling out of a joint de-confliction agreement with Washington, created to avoid collisions.
Air operations in Iraq, where Australia has also been involved in the anti-Daesh coalition, would continue, the ministry added.
Coalition troops were working in the area alongside local forces who are being trained to fight ISIL.
There are fears Canadian military aircraft operating over Syria could be caught in the middle of a new and potentially explosive dispute between the USA and Russian Federation.
After all, not only had he just launched a new military offensive against Bashar al Assad's government - putting the United States on more than one side in Syria's civil war - but there's also the fact that American troops are already serving in Syria.
A Syrian military official in Damascus said the truce was not extended.
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