The White House declared in a statement that the attack “fits into a pattern of behaviour in which Russia disregards the international rules-based order, undermines the sovereignty and security of countries worldwide, and attempts to subvert and discredit Western democratic institutions and processes”.
Mrs May’s decision prompted Valentina Matviyenko, Russia’s federation council speaker, to ask Vladimir Putin to act “promptly and toughly”.
Nikki Haley, the US’ Ambassador to the United Nations, warned that “immediate concrete measures” need to be taken to address issues with Russia.
She warned that if nothing is done, further chemical weapons will be used.
Ms Haley stated: “If we don’t take immediate concrete measures to address this now, Salisbury will not be the last place we see chemical weapons used.
“They could be used here in New York or in cities of any country that sits on this council.
“This is a defining moment.
“Time and time again member states say they oppose the use of chemical weapons under any circumstances.
“Now one member stands accused of using chemical weapons on the sovereign soil of another.
“The credibility of this council will to survive if we fail to hold Russia to account.”
More to follow…