Two days earlier, a U.S. Navy F/A-18 warplane shot down a Syrian Air Force Su-22 attacking U.S. -backed forces near Raqqa, the Islamic State's de facto capital.
The defense ministry statement also announced the suspension of a hotline meant to minimize incidents with the U.S.in Syrian airspace.
The Pentagon vowed to continue all its anti-ISIS operations in Syria after Russia's warning.
"We have said before that demonstrated hostile intent and actions of pro-regime forces towards coalition partner forces in Syria that are conducting legitimate counter-Isis operations in Syria, will not be tolerated", Davis said.
The area recently became a battleground as pro-regime forces repeatedly attempted to enter the 55-kilometer deconfliction zone that encircles the base, each time eliciting a swift and brutal response from U.S. Central Command.
United States forces in southern Syria have shot down an Iranian-made armed drone in the second such incident in 12 days, in a further sign that Washington and Tehran's agendas are colliding along the Syrian-Iraqi desert frontier.
The Syrian regime and Iranian militias have increasingly tried to encroach on USA allied territory, leading to warnings and occasional bombings.
Fighting and bombardment meanwhile resumed early Tuesday between Syrian government forces and rebels in the southern city of Daraa and nearby areas, where a 48-hour truce had gone into effect on Saturday.
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USA officials likely want to avoid seeing things spiral to a point that ultimately could require a bigger ground troop deployment in Syria than intended, said Stevenson, who is now a senior fellow with the International Institute for Strategic Studies. The US justified the strike saying its planes had acted to defend US-backed forces seeking to capture Raqqa, the Islamic State stronghold in northeast Syria, 9news.com reported.
It is the second downing of a pro-regime drone in the area and comes amid heightened tensions in the region following the US shootdown of a Syrian fighter jet. Israeli security officials said on Monday they were studying the missile strike to see what they could learn about its accuracy and capabilities.
Activists say a "de-escalation agreement" brokered by Iran, Russia and Turkey in May has brought little relief.
The ministry also called on the us military to provide a full account of why it made a decision to shoot down the Syrian SU-22. Daraa-based Ahmad al-Masalmeh confirmed the truce was extended Monday but did not know for how long.
The U.S. then deployed a truck-mounted missile system in Syria, showing that the U.S. military intends to protect itself. He spoke on condition of anonymity in line with regulations.
Daraa is where the March 2011 uprising against the Assad family's four-decade rule began.
American officials maintain there is no direct connection between the downing of the Syrian warplane and the Iranian missile strike on eastern Syria.
Al-Tanf is a strategic point near the Syrian, Iraq and Jordanian borders.
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