The former ExxonMobil chief executive noted that holding such talks would require the participation of Syrian President Bashar al-Assad's regime along with its allies. The US has been providing air and ground support to the Iraqi forces fighting Islamic State militants and have helped the country recapture most of the cities that it had lost to them.
"Assad now knows there is a red line with regard to the use of chemical weapons".
"In this case now, we have very limited options, and look, it's concerning that the secretary of State. said that the future's up to the people in Syria on what happens with Assad", Rubio said on the radio show AM Tampa Bay.
"Developments in Syria have changed the situation fundamentally", Johnson said, adding that his priority now is to work with the United States, and other members of the G7 "for a ceasefire on the ground and an intensified political process".
"As for the [Johnson's] words that US Secretary of State Rex Tillerson will deliver a coordinated position on Syria to Russian Federation, thereby Boris Johnson confirms that the United Kingdom does not consider itself an independent power", Kosachev emphasized.
Russian Federation sent warplanes to Syria in 2015 in a successful effort to help Assad maintain his hold on power and expand the territory under his control.
Sir Michael Fallon accused Moscow of being complicit in war crimes because it is the Syrian regime's main backer.
A communication link between US and Russian military officials has protected pilots flying missions over the crowded skies of war-ravaged Syria, but now Moscow says it is suspending its co-operation over an American missile strike.
The Syrian regime denies that it carried out the nerve agent gas attack in Idlib.
The coalition includes some 60 countries, with some launching their own strikes into Syria.
Tillerson was critical of Russia immediately after the US airstrikes Thursday in Syria but made clear Sunday that Russians were not the target.
Even so, Tillerson said, without naming North Korea, that "if you violate global agreements, if you fail to live up to commitments, if you become a threat to others, at some point a response is likely to be undertaken".
In response, Syria's ally Russian Federation accused the USA of encouraging "terrorists" with unilateral actions.
But he also backed calls for an independent inquiry into the suspected chemical weapons attack.
If President Donald Trump needs to do more in Syria "he will do more, " U.S. Ambassador to the United Nations Nikki Haley said on CNN's "State of the Union".
Moscow has sought to deflect blame from its long-time ally al-Assad over the incident and says Syrian jets struck a rebel arms depot where "toxic substances" were being put inside bombs.
On the other side of the argument was Liberal Democrat leader Tim Farron, who suggested the USA was trying to shut the Foreign Secretary out of a sensitive process.