The inspectors arrived on Saturday, but in a statement posted on Twitter, the British delegation said Russian Federation and Syria had not yet allowed inspectors access to Douma.
She did not say why sanctions would be imposed but the USA ambassador to the United Nations, Nikki Haley, said on Sunday that the United States is preparing new sanctions on Russian Federation over its support of Syrian President Bashar al-Assad.
Britain's U.N. Ambassador Karen Pierce blamed Russian Federation for repeatedly vetoing resolutions on the use of chemical weapons in Syria and said the United Kingdom took military action "to save lives", on the legal basis of "humanitarian intervention".
The United States, Britain and France carried out a wave of punitive strikes against Bashar al-Assad´s Syrian regime on Saturday in response to alleged chemical weapons attacks that President Donald Trump branded the "crimes of a monster".
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The Trump administration has placed sanctions on Russian individuals and entities, including penalties last month targeting Russian oligarchs who are close to President Vladimir Putin. Moscow has denied any wrongdoing.
White Helmets first-responder volunteer and activists claimed an alleged chemical attack on April 7 by the Syrian government killed over 40 people in the town of Douma, the allegations that drew worldwide outrage and prompted Washington and its allies to consider a military response. The joint operation came one week after a suspected chemical attack outside Damascus left more than 40 people dead.
He noted that Russian and US militaries have a hotline to prevent incidents, adding that it's not clear if it would be sufficient amid mounting tensions.
Tayyip Erdogan, president of Syria's neighbor Turkey, said on Friday he had spoken by phone with Trump and Putin and told both that increasing tensions in the region was not right.
Oil prices jumped to their highest level in more than three years on Wednesday after Trump's missile warning, and United States stock index futures fell sharply amid alarm over possible Russian-U.S. conflict over Syria.
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Deputy Russian foreign minister Sergei Ryabkov blamed Western air strikes carried out on Saturday for holding up the OPCW mission. Lavrov also repeated Russia's claim that there was no chemical attack in Douma, asserting that "what did take place was.staged".
"Everyone is going to feel it at this point", Ms Haley said, warning of consequences for Assad's foreign allies. He said European Union foreign ministers will meet Monday to discuss the situation and put forward proposals for steps going forward.
The US and its allies launched the airstrikes in response to last week's suspected chemical attack in the Syrian city of Douma.
"You will see that Russian sanctions will be coming down", Haley said.
Putin said the United States actions in Syria made the humanitarian catastrophe worse and caused pain for civilians. Defence Secretary Jim Mattis said there were no reports of U.S. losses in what he described as a heavy but carefully limited assault. "The use of a nerve agent in the U.K.in recent weeks is part of a pattern of disregard for these norms".
The statement clearly was aimed at discouraging the West from more attacks on Syria that could endanger Assad's gains on the battlefield, where Russian support has helped him secure control of most strategic areas.
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Assad on Sunday appeared briefly on state TV meeting with visiting Russian lawmakers, telling them the strikes were accompanied by a campaign of "lies and misinformation" against Syria and Russia in the U.N. Security Council. And the Ministry of Defence even noted that while Syria shot down some cruise missiles, Damascus did so using its own Soviet-made - not Russian-made - equipment.