Mr Johnson, who called off a trip to Moscow on Monday, is attempting to co-ordinate a united response from the G7 group of industrialised nations, whose foreign ministers meet in Italy this week.
British Foreign Secretary Boris Johnson will call for new sanctions on Russian Federation if it does not cut ties with Syrian President Bashar al-Assad following an escalation of the conflict in Syria, the Times reported Monday.
She stressed that the main priority for the United States remains tackling Islamic State in the region.
The top Russian and Iranian generals have condemned the US missile strike against a Syrian military base and vowed to continue their fight against "terrorists", which they generally call opponents of Syrian President Bashar al-Assad.
A joint command center made up of the forces of Russia, Iran and militias supporting Syrian President Bashar al-Assad on Sunday said the us strike on a Syrian air base on Friday crossed "red lines" and it would respond to any new aggression and increase its support for its ally.
"I acted in the vital national security and foreign policy interest of the United States", Trump said in a letter to both chambers of Congress dated Saturday.
"Tonight I ordered a targeted military strike on the airfield in Syria from where the chemical attack was launched", Trump told reporters Thursday night at his Florida club, where he hosted Chinese President Xi Jinping earlier in the evening.
Iraq says Islamic State has lost most of the land it seized
Islamic State has used hundreds of vehicle bombs along with drones rigged with explosives in Mosul. At that time, the jihadist group controlled more than 40 percent of Iraq.
A chemical weapons attack, likely launched by Syrian President Bashar al-Assad in the rebel-held town of Khan Sheikhoun on Tuesday, is first and foremost yet another horrific war crime in a country that has been devastated by civil war. Syrian activists claimed that the attack had come from the Assad-led government's airstrikes, although the Syrian army denied involvement in the strike.
US Secretary of State Rex Tillerson says Russia's inaction played a part in fuelling a deadly gas attack on Syrian civilians.
U.S. forces conducted a missile strike on a Syrian military base last week that it said was responsible for a chemical weapons attack.
"So, really, now what happens depends on how everyone responds to what happened in Syria, and make sure that we start moving towards a political solution, and we start finding peace in that area".
Elsewhere in Syria, at least seven people were killed in air strikes in Eastern Ghouta, near the capital Damascus.
Johnson said Britain called on Russian Federation to do everything possible to bring about a "political settlement in Syria".
The U.S. military strategy on Syria has complicated Trump's attempt to warm relations with Russian Federation.