US President Donald Trump has signaled a startling about-turn toward Assad, who many in the worldwide community hold responsible for Tuesday's horrific events.
The comments represented a departure from what she had
She stressed that the main priority for the United States remains tackling Islamic State in the region.
Fallon also repeated his country's stance against a Syrian future involving current regime leader Bashar al-Assad.
A top Senate Democrat and Republican differed Sunday on Trump having used executive powers to attack the Syrian government but agreed that Congress must be included in further actions. "Russian Federation should ask themselves, 'What are we doing here?'" McMaster said.
Tillerson was critical of Russia immediately after the US airstrikes Thursday in Syria but made clear Sunday that Russians were not the target. So Trump's decision to launch the strikes - which President Barack Obama declined to do after a 2013 chemical attack - has raised optimism among rebels that Trump will more directly confront Assad.
However, "whether Russian Federation was complicit here or whether they were simply incompetent or whether they got outwitted" by the Syrian government, they had "failed in their commitment to the global community", he said.
"Russian intelligence may not be as good as ours, but it's good enough to know the Syrians had chemical weapons, were using chemical weapons".
It was not clear whether planes from Shayrat participated in strikes Saturday that killed at least 18 civilians near the small city of Sheikhoun. "Or do they want it to be a relationship in which we can find areas of cooperation that are in our mutual interest?"
"I think the president has authorization to use force", he said.
Moscow has sought to deflect blame from its long-time ally Assad over the incident and says Syrian jets struck a rebel arms depot where "toxic substances" were being put inside bombs.
"You saw this bad tragedy on innocent people, a lot of them children, and the first reaction from Russian Federation wasn't 'how frightful, ' it wasn't 'how could they do this, ' it wasn't 'how did this happen, ' it was: 'Assad didn't do it.' Why was that the reaction?" "We're not going to have you cover for this regime anymore, '" Nikki Haley, the USA ambassador to the United Nations, said on NBC's "Meet the Press".
Haley added that what the USA government considered an inappropriate response from Moscow prompted the ongoing investigation into Russia's role in the chemical attack.
Haley disagreed, telling Tapper that the USA government has evidence. We have seen it fail time and again, in Iraq, in Libya and in Afghanistan. "If you look at his actions, if you look at the situation, it's going to be hard to see a government that's peaceful and stable with Assad".
Other than that, he added, "there is no change to our military posture" toward Syria.
"By sending Tomahawk missiles to attack the airfield, aeroplanes, and equipment believed to be involved, it has sent a strong signal to the Syrian regime to think twice before using gas in future".
Elsewhere in Syria, activists opposed to the Islamic State group said a USA -led coalition airstrike hit a boat carrying civilians fleeing across the Euphrates River.
"There's not any sort of option where a political solution is going to happen with Assad at the head of the regime", Haley told the program's anchor Jake Tapper. These countermeasures will have the effect of slowing down the US-led coalition's assault on IS strongholds and give the terrorists room to regroup and defend themselves better.
However, he stopped short of accusing Russian Federation of being directly involved in the planning or execution of the attack, saying he had not seen "any hard evidence" to suggest the country was an accomplice to Mr Assad.