The top Russian and Iranian generals have condemned the US missile strike against a Syrian military base and vowed to continue their fight against "terrorists", which they generally call opponents of Syrian President Bashar al-Assad. Haley said that it was hard to see a peaceful and stable Syria with Assad as president [CNN report], based on his action and the current situation in Syria. "Once the [IS] threat has been reduced or eliminated, I think we can turn our attention directly to stabilising the situation in Syria".
Members of Trump's administration have hinted that the U.S.is not done intervening in Syria..
Assad has undermined his own legitimacy with chemical attacks on his people, Tillerson said, but it's not the US' role- but the Syrian people's - to determine Assad's fate.
"If Russia wants to be absolved of responsibility for future attacks, [President] Vladimir Putin needs to enforce commitments, dismantle Assad's chemical weapons arsenal for good and get fully engaged" with the United Nations peace process on Syria.
Tillerson said on CBS' "Face the Nation" that Russians were not targeted by the strikes.
US -backed rebels groups have long pleaded for more USA intervention and complained that Washington has only fought the Islamic State group. "We will bolster up in every way our capability for self-defense to cope with the USA evermore reckless moves for a war and defend ourselves with our own force".
Tillerson also shed light on President Donald Trump's meeting with Chinese President Xi Jinping last week at Mr. Trump's Mar-a-Lago resort in Florida, where both presidents had "extensive discussions around the risky situation in North Korea", Tillerson said. Admiral Michelle Howard, who heads U.S. naval forces in Europe and Africa, told Reuters U.S. forces are prepared to carry out further strikes if needed.
Mr Tillerson will go ahead with his visit to Russian Federation to deliver a "clear and coordinated" message to Moscow, which continues to deny Syrian forces used chemical weapons last week.
A day before, defending the United States strikes on a Syrian air base suspected of using chemical weapons, Haley warned the Assad regime of more strikes if it did not stop using chemical weapons against innocent civilians.
Rebels and residents in northwestern Idlib province said jets believed to be Russian conducted eight raids on Sunday on the town of Khan Sheikhoun where the chemical attack took place but no casualties were reported.
It marked a major departure from the criticism of USA military intervention and apparent support for Russia's role in Syria that Mr Trump voiced during his election campaign.
White House national security adviser H.R. McMaster says that while the USA would push for regime change in Syria, "We're not the ones who are going to effect that change".
Rouhani said "neutral countries should come and assess to make it clear where the chemical weapons came from".
Boris Johnson chose to scrap his visit to Moscow on Monday, saying he deplored "Russia's continued defense of the Assad regime". "From now on we will respond with force to any aggressor or any breach of red lines from whoever it is and America knows our ability to respond well", said the statement published by the group on media outlet Ilam al Harbi (War Media).