After warning Russian Federation on Wednesday of imminent military action, U.S. President Donald Trump said on Thursday he was holding meetings on Syria and expected to make decisions "fairly soon".
Russian Federation is a major backer of the government of Syrian President Bashar al-Assad in the country's civil war, and strongly opposes the US claim that Syrian government forces attacked a rebel-held town near Damascus on Saturday with chemical weapons.
"Never said when an attack on Syria would take place".
"We're looking very, very seriously, very closely, at that whole situation", the President said during a meeting with farm state lawmakers. "So they'll be made fairly soon".
The Times and the Daily Telegraph newspapers reported that the cabinet would back May in joining any US-led action, as Royal Navy submarines armed with cruise missiles were moving into range.
The Cook - named after a Marine Colonel who suffered depravation and starvation as a Vietnam prisoner of war - has past experience tangling with the Russian military, having been deployed to the Black Sea during the recent crisis in Crimea.
Russia's ambassador to Lebanon said any missiles fired at Syria would be shot down and the launching sites targeted - a stark warning of a potential major confrontation.
"The immediate priority is to avert the danger of war", said Ambassador Vassily Nebenzia following closed-door Security Council talks.
"China is anxious about the possibility of escalation of tension", Geng said.
Duke of Edinburgh leaves the hospital after hip surgery
The palace says "his royal highness would like to convey his appreciation for the messages of good wishes he has received". A full recovery can take up to three months, although the majority of people will be up on their feet within a few days.
The U.S. now has blood and urine samples from last Saturday's deadly attack in Syria that have tested positive for chemical weapons, according to two U.S. officials familiar with the intelligence.
White House press secretary Sarah Huckabee Sanders insisted no final decisions had been taken and that "all options are on the table".
Moscow on Thursday night warned against any USA move that could trigger a conflict between the nuclear-armed rivals. Inspectors with the global chemical weapons watchdog, the Organisation for the Prohibition of Chemical Weapons, are due to investigate the incident.
That may prove too little, too late. "All the indications are that the Syrian regime was responsible".
In Paris, France's Emmanuel Macron upped the pressure on Moscow by stating he had "proof" that the Assad's regime had used chemical weapons, and vowing a response "at a time of our choosing".
Prime Minister Theresa May was holding an emergency cabinet to discuss joining mooted strikes by the U.S. and allies, as rival politicians and some Conservative colleagues called for a parliamentary vote before any British involvement.
"There has been no decision to take military action at this point".
In April a year ago Trump ordered Tomahawk strikes on the Shayrat Airbase in response to a similar chemical weapons attack on rebel-held Khan Sheikhun. British officials said up to 75 people were killed.
The Assad regime is known to have stocks of the nerve agent sarin, and has previously used a mixture of chlorine and sarin in attacks, say USA officials.