Russian Federation has military forces, including air defences, in several areas of Syria to support President Bashar al-Assad in his long war against anti-government rebels.
President Trump on Wednesday issued a stern warning to Russian Federation, tweeting that he will direct an air strike at Syria in response to last week's chemical attack and chastising the Kremlin for its support of Syrian President Bashar Assad.
President Trump's fusillade of tweets about Syria, Russia and China this week set a new standard for contradictory and inconsistent positions in Trump's approach to war, trade and relations with adversaries.
"His administration may have drafted a Russian Federation policy through the interagency process", said Michael A. McFaul, a former American ambassador to Russian Federation, "but Trump seems completely disconnected from it, like he seems to be on many foreign policies".
"Good souls will not be humiliated", Assad tweeted, while hundreds of Syrians gathered in Damascus, the capital, where they flashed victory signs and waved flags in scenes of defiance after the early morning barrage.
After the attack, the rebel group holed up in Douma-Jaish al-Islam-finally agreed to withdraw from the town.
He said it was not necessary for the U.S. Congress to give Trump a new authorization to use military force because the existing one "gives him the authority he needs to do what he may or may not do".
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But his remarks could raise fears of direct conflict for the first time between major powers backing opposing sides in Syria's protracted civil war.
Trump said earlier this month - before the weekend's suspected chemical attack on civilians at the hands of the Assad regime - that he wanted to withdraw USA troops from Syria.
Disputing the Russian military's contention that Syrian air defense units downed 71 allied missiles, McKenzie said no US or allies missiles were stopped. Russian Federation and Iran, Syria's allies, have also denied that Mr. Assad used chemical weapons.
White House press secretary Sarah Sanders said Monday that the President still wants to pull United States troops from Syria once ISIS is defeated there and rejected the notion that his comments about a future withdrawal may have emboldened the Syrian President Bashar al-Assad.
Sanders said "the only individuals" responsible for the suspected chemical attack "don't reside in this country".
A year ago Trump ordered a US missile strike on the regime's Shayrat airfield in response to a chemical attack that killed 80 people in Khan Sheikhoun in the northwestern province of Idlib.
The U.S. ambassador in Moscow, John Huntsman, said in a video, "Before we took action, the United States communicated with" Russia to "reduce the danger of any Russian or civilian casualties".