Donald Trump has declared that he supports Theresa May's sanctions
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 not survive if we fail to hold Russia to account.”
As tensions between the UK and Russia start to mount, Evgenny Primakov Jr, known as a “trusted representative” of Putin, declared that relations between the two nations could struggle to recover.
He asked both sides to “make a step backwards and calm down a bit”.
Evgenny Primakov Jr is known as a 'trusted representative' of Vladimir Putin
Nikki Haley warned that 'immediate concrete measures' need to be taken
He went on: “Frankly, in Moscow, we are in shock. The whole thing looks insane. No one here believes this was a Russian attack.”
Mr Primakov instead hinted that the incident surrounding Mr Skripal was a plot to influence the upcoming election in Russia.
He also told The Telegraph: "We are absolutely sure, 100 per cent sure, that the whole thing is aimed at our elections. In my personal opinion, I'm absolutely sure Sergei Skripal was poisoned by the British or American secret services.
"The idea is to make our election look illegitimate. [For Russia] to commit such a thing a week before the presidential election is insane. And when we try to explain our position we are told, 'Russia is an evil empire and you do it deliberately because you do it.’ "