The UK said Russian Federation is responsible and expelled 23 diplomats in retaliation.
The move follows Britain's decision Wednesday to kick 23 Russian diplomats out of the country after concluding that Russia was responsible for a nerve agent attack on former Russian double agent Sergei Skripal and his daughter in England earlier this month.
On Wednesday, she said Russian Federation had responded with "sarcasm, contempt and defiance". She clashed with Labour leader Jeremy Corbyn, who questioned the lack of multilateralism in her approach.
NATO promised to help investigate what it called "the first offensive use of a nerve agent" in Europe or North America since the military alliance was founded in 1949. And British officials requested a U.N. Security Council meeting. "The Kremlin wants to dismantle the worldwide rules-based system".
"The Russians complained recently that we criticize them too much", Haley said.
"The overall impact of what we are planning to do, will have serious repercussions for Russian Federation", a senior British official told VOA.
British police said there is no apparent link to the attack on Glushkov and the poisoning of the Skripals. May had given an ultimatum to the Kremlin to explain the poisoning.
Russian Foreign Ministry spokeswoman Maria Zakharova dubbed the United Kingdom claims in the Skripal poisoning case as "insane".
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In increasingly barbed and menacing exchanges between the British and Russians, reminiscent of the height of the Cold War, Kremlin officials have warned it is risky to threaten nuclear-armed Russia. "It is not clear to me that London's response will hit the Kremlin where it hurts".
The intervention by the White House follows angry exchanges between British and Russian representatives at an emergency meeting of the United Nations security Council and the UK's decision to expel 23 Russian diplomats.
New concerns surfaced Friday about the death this week of a London-based Russian businessman, Nikolai Glushkov, found dead at his south London home on Monday.
Media reports in London suggest he may have been strangled.
North Atlantic Treaty Organisation allies have expressed their support for Britain following the first use of a nerve agent in Europe since World War II.
Russian Federation has refused Britain's demands to explain how Novichok, a nerve agent first developed by the Soviet military, was used against Sergei Skripal, 66, and his daughter Yulia, 33, who were found unconscious on a bench outside a shopping centre on March 4 in the southern English city of Salisbury.
Britain says Russian Federation is responsible for the poisoning with a Soviet-era "Novichok" nerve agent of Sergey Skripal and his daughter Yulia They were found unconscious on March 4 in the city of Salisbury in southern England and remain critically ill in hospital, according to Vestnik Kavkaza. He said the agent was created to wreck the human body and do "irreparable" damage, saying the Skripals would be left as "invalids".
"There is no alternative conclusion other than that the Russian state was culpable for the attempted murder of Mr Skripal and his daughter", May told parliament. Time and time again, member states say they oppose the use of chemical weapons under any circumstance.