As Western countries back UK's findings, British Ambassador Karen Pierce and Russian Ambassador Vassily Nebenzia traded accusations at a UN Security Council meeting held to discuss the Novichok attack investigation and charges against two Russians.
Sergei Skripal, a former colonel in Russian military intelligence who betrayed dozens of agents to Britain's MI6 foreign spy service, and his daughter Yulia, were found unconscious on a public bench in the southern city of Salisbury on March 4.