The Pentagon said that it did not seek to fight the Syrian regime, Russian Federation or pro-regime forces, but was merely acting in defence of its coalition partners in Syria.
Theresa May has played down suggestions RAF pilots could be at risk after Russian Federation warned it would track warplanes from the US-led coalition in Syria as potential targets a day after the U.S. military shot down a Syrian air force jet.
"It's important and crucial that we keep lines of communication open to deconflict potential issues", Sean Spicer told reporters on Monday.
The missile attack came amid recent confrontations in Syria between US -backed forces and Iranian-backed pro-government factions. "That's why there's no threat of direct confrontation between Russian Federation and American aircraft".
"Multiple military actions of USA aviation under the guise of fighting terrorism against the legal military of a state that is a member of the United Nations are a flagrant violation of worldwide law and constitute de facto military aggression against the Syrian Arab Republic", the ministry said, according to The Washington Post.
The United States and Russian Federation, which has been providing an air cover for Syria's President Bashar Assad since 2015 in his offensive against the Islamic State group, have a standing agreement that should prevent in-the-air incidents involving US and Russian Federation jets engaged in operations in Syria.
"What is this, if not an act of aggression?" he asked.
In comments to Russian news agencies, Russian Deputy Foreign Minister Sergei Ryabkov compared the downing to "helping the terrorists that the U.S.is fighting against".
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The new clash comes two months after the USA launched a barrage of Tomahawk missiles at a Syrian airbase that had hosted airplanes responsible for a chemical weapons attack in Idlib province.
The recent developments in Syria, specifically the shooting down the Syrian Su-22 by the US-led coalition, as well as the Iranian missile strike on IS terrorists' positions, heightens the risk of escalating the Syrian conflict, the United Nations warned on Monday.
Adding to the tension, Iran launched missiles at Islamic State targets in eastern Syria on Sunday, a strike seen as a projection of military power into part of Syria identified as a top priority by Damascus and its allies.
On Monday morning, the area where the regime and SDF fighters clashed was quiet and the US-backed alliance was continuing to battle IS inside Raqqa, the Syrian Observatory for Human Rights monitor said.
SDF spokesman Talal Sillo said the government wants to thwart the SDF offensive to capture Raqqa.
Russia's foreign ministry accused Washington of failing to use the hotline before downing the plane near Raqqa, and called for a "careful investigation by the United States command" into the incident.
The Syrian army said its warplane was on a mission against IS when it came under fire, according to state television.
"If the regime continues attacking our positions in Raqqa province, we will be forced to retaliate", a SDF spokesman said.