Defence Secretary Sir Michael Fallon said Russian Federation was responsible for "every civilian death" in the Syrian chemical weapons attack, claiming President Putin was to blame "by proxy" as Assad's "principal backer".
An air strike killed 15 civilians including four children in Syria's northwestern province of Idlib on Saturday, the Syrian Observatory for Human Rights monitor said.
The cancellation "once again confirms doubts about the added value of dialogue with the British, who don't have their own position on the majority of current issues", the foreign ministry said in a statement.
A chemical attack on the residential part of Khan Sheikhun killed 85 civilians, including 20 children and 13 women.
"The Russians were never targeted in this particular strike", Tillerson said.
Graham said he supports the president's decision to order the strikes, but wants to see more from the administration on Syria.
But the cancellation of tomorrow's meeting, which came after discussions with US Secretary of State Rex Tillerson, led to him being criticised as "Washington's poodle", an attack dismissed by the Foreign Office.
Following the suspected attack, US President Donald Trump launched air strikes against a Syrian government air base, and branded Syrian leader Bashar al-Assad a "dictator" who had "launched a awful chemical weapons attack on innocent civilians".
And the Kremlin said Russian President Vladimir Putin and Iran's leader Hassan Rouhani condemned the cruise-missile attack Thursday on Syria's Shayrat airfield and urged the United Nations Security Council to take action against the USA for launching the attack that violated "the sovereignty of an independent country".
"If we say democracy, let's take this step", he said.
Haley went on to describe the missile strike as a "moderate approach" and warned that Trump is capable of much more.
Russian Federation had agreed to ensure Syria's chemical weapons stockpiles were destroyed - and its failure to do this enabled the attack, he said.
Haley did not say the United States had changed its policy.
Turkey's foreign minister said Sunday that Turkey has no obligation to take a side in any dispute between the US and Russian Federation.
Barazi did not offer further details, and the U.S. Defense Department referred questions about conditions at the air base to the Damascus government.
Rouhani said the USA strike would not affect Iran's Syria policy, while Supreme Leader Ayatollah Ali Khamenei said Iran would not withdraw in the face of such aggressions.
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