Russian Federation has been a staunch ally of Syrian President Bashar Assad's government and has helped turn the tide of war in his favor since entering the conflict in September 2015.
Senior Russian figures, including the head of the military, have warned that USA missiles will be shot down and their launch sites targeted if Russian personnel come under threat.
The United States has blamed the Syrian government for a deadly chemical weapons attack this month and slammed Russian Federation for failing to stop its ally, President Bashar al-Assad, as Western allies considered military strikes on Syria.
Nikki Haley, the USA ambassador to the United Nations, on Friday accused Russian Federation of lies and covering up for Assad, which she said had used chemical weapons at least 50 times in the past seven years of warfare.
The Russia-U.S. military contacts on Syria are not enough to meet the needs of dialogue, and the two countries should use diplomatic methods rather than threats when communicating with each other, Russian Foreign Minister Sergei Lavrov said Friday.
A fact-finding mission from the Organization for the Prohibition of Chemical Weapons is expected to arrive in Douma on Saturday.
Russian defence ministry spokesman Igor Konashenkov said the military had "proof that testifies to the direct participation of Britain in the organising of this provocation in Eastern Ghouta".
Russia's foreign minister says Moscow has received a document from a Swiss lab that analyzed the samples in the nerve agent poisoning of an ex-Russian spy, which points at a Western-designed nerve agent as a likely cause.
But the Violations Documentation Center (VDC), which records alleged violations of global law in Syria, said bodies were found with oral foaming, cyanosis, and corneal burns.
There have been calls from opposition parties and some Conservative MPs for Parliament to have a vote beforehand.
He said: "More bombing, more killing, more war will not save life. We can not take such risks", said Mr Dvorkovich at a forum.
The United States, France and the United Kingdom today carried out a series of missile attacks against three targets associated with the production and storage of chemical weapons in Syria.
On Wednesday, the US President said the missiles were "coming", but on Thursday he tweeted that he had "never said when".
Russian Deputy Prime Minister Arkady Dvorkovich said worldwide relations should not depend on one person's morning mood, in apparent reference to Mr Trump's tweets. It "could be very soon or not so soon at all".
"I hope hot heads will cool down and that will be it", he told reporters.
UK Prime Minister Theresa May said the military action was believed to have been successful.
The Russian ambassador to the United States railed against the US-led coalition campaign against suspected Syrian chemical weapons facilities. But the administration appeared determined to deliver on the president's threat to punish the use of poison gas.