The jet was downed on Sunday evening after regime forces targeted the US-backed Syrian Democratic Forces, an alliance of Arab and Kurdish fighters battling IS. Chris Murphy of CT warned Tuesday that the United States could be edging toward a military conflict with Iran and Russian Federation in Syria.
Syria condemned what it called a "flagrant attack" that would have "dangerous repercussions".
The many parties fighting in Syria have as many interests to advance, but they should realise that the Syrian conflict can not be settled through a military solution if stability is to last.
It was believed to be the first air-to-air kill of a manned aircraft by a U.S. military jet since the Kosovo campaign in 1999.
"With (the help of) intensive Russian bombing they are trying to advance but we are repelling them", he said.
It was the latest skirmish between the coalition and regime forces in the increasingly tense and crowded space in Syria's north and east.
Dillon would not say if Russian Federation had used the line to warn the Americans ahead of the strike, but a U.S. defense official confirmed to AFP that it had.
It said Washington had failed to use the hotline - a vital incident-prevention tool - before downing the plane near Raqa.
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".
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Raising concerns over what he called "a risky escalation", the CT senator said it was not in the U.S. interest to get involved in the Syrian war.
But the coalition said the move was defensive.
An army statement said the pilot of the plane was missing.
On Monday, a day after the downing of the Syrian plane, Russian Federation threatened aircraft from the USA -led coalition in Syrian-controlled airspace and suspended a hotline meant to avoid collisions in retaliation for the downing.
A Western intelligence source said it was "unquestionably Iranian".
The Guards said a "large number" of militants had been killed and equipment and weapons were destroyed.
"I can tell you it was an Iranian-made drone", Davis said, declining to speculate on who specifically was operating it.
"The spilling of any pure blood will not go unanswered", a Guards statement said.