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SALISBURY, ENGLAND - MARCH 16: Police officers in protective suits and masks work near the scene where former double-agent Sergei Skripal and his daughter, Yulia were discovered after being attacked with a nerve-agent on March 16, 2018 in Salisbury, England. Britain has expelled 23 Russian diplomats over the nerve agent attack on former spy Sergei Skripal and his daughter Yulia, who both remain in a critical condition. Russian Foreign Minister Sergei Lavrov has responded by saying that Moscow will also expel British diplomats. (Photo by Jack Taylor/Getty Images)

SALISBURY, ENGLAND - MARCH 16: Police officers in protective suits and masks work near the scene where former double-agent Sergei Skripal and his daughter, Yulia were discovered after being attacked with a nerve-agent on March 16, 2018 in Salisbury, England. Britain has expelled 23 Russian diplomats over the nerve agent attack on former spy Sergei Skripal and his daughter Yulia, who both remain in a critical condition. Russian Foreign Minister Sergei Lavrov has responded by saying that Moscow will also expel British diplomats. (Photo by Jack Taylor/Getty Images)
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SALISBURY, ENGLAND - MARCH 16: Police officers in protective suits and masks work near the scene where former double-agent Sergei Skripal and his daughter, Yulia were discovered after being attacked with a nerve-agent on March 16, 2018 in Salisbury, England. Britain has expelled 23 Russian diplomats over the nerve agent attack on former spy Sergei Skripal and his daughter Yulia, who both remain in a critical condition. Russian Foreign Minister Sergei Lavrov has responded by saying that Moscow will also expel British diplomats. (Photo by Jack Taylor/Getty Images)

SALISBURY, ENGLAND - MARCH 16: Police officers in protective suits and masks work near the scene where former double-agent Sergei Skripal and his daughter, Yulia were discovered after being attacked with a nerve-agent on March 16, 2018 in Salisbury, England. Britain has expelled 23 Russian diplomats over the nerve agent attack on former spy Sergei Skripal and his daughter Yulia, who both remain in a critical condition. Russian Foreign Minister Sergei Lavrov has responded by saying that Moscow will also expel British diplomats. (Photo by Jack Taylor/Getty Images)
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SALISBURY, ENGLAND - MARCH 16: A police officer in a protective suit and mask works near the scene where former double-agent Sergei Skripal and his daughter, Yulia were discovered after being attacked with a nerve-agent on March 16, 2018 in Salisbury, England. Britain has expelled 23 Russian diplomats over the nerve agent attack on former spy Sergei Skripal and his daughter Yulia, who both remain in a critical condition. Russian Foreign Minister Sergei Lavrov has responded by saying that Moscow will also expel British diplomats. (Photo by Jack Taylor/Getty Images)

SALISBURY, ENGLAND - MARCH 16: A police officer in a protective suit and mask works near the scene where former double-agent Sergei Skripal and his daughter, Yulia were discovered after being attacked with a nerve-agent on March 16, 2018 in Salisbury, England. Britain has expelled 23 Russian diplomats over the nerve agent attack on former spy Sergei Skripal and his daughter Yulia, who both remain in a critical condition. Russian Foreign Minister Sergei Lavrov has responded by saying that Moscow will also expel British diplomats. (Photo by Jack Taylor/Getty Images)
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SALISBURY, ENGLAND - MARCH 08: A police officer has a protective mask removed on an industrial site during investigations into the poisoning of Sergei Skripal in Salisbury who was found critically ill on a bench with his daughter on March 4 and were taken to hospital sparking a major incident on March 8, 2018 in Wiltshire, England. Sergei Skripal who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010 and his daughter remain critically ill after being attacked with a nerve agent. (Photo by Jack Taylor/Getty Images)

SALISBURY, ENGLAND - MARCH 08: A police officer has a protective mask removed on an industrial site during investigations into the poisoning of Sergei Skripal in Salisbury who was found critically ill on a bench with his daughter on March 4 and were taken to hospital sparking a major incident on March 8, 2018 in Wiltshire, England. Sergei Skripal who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010 and his daughter remain critically ill after being attacked with a nerve agent. (Photo by Jack Taylor/Getty Images)
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SALISBURY, ENGLAND - MARCH 09: Police officers search ahead of the visit by Home Secretary Amber Rudd to the scene at the Maltings shopping centre in where former Russian double agent Sergei Skripal and his daughter were found critically ill after exposure to a nerve agent on March 4 and were taken to hospital sparking a major incident, in Salisbury on March 9, 2018 in Wiltshire, England. Sergei Skripal who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010 and his daughter remain critically ill after being exposed to an 'unknown substance'. (Photo by Matt Cardy/Getty Images)

SALISBURY, ENGLAND - MARCH 09: Police officers search ahead of the visit by Home Secretary Amber Rudd to the scene at the Maltings shopping centre in where former Russian double agent Sergei Skripal and his daughter were found critically ill after exposure to a nerve agent on March 4 and were taken to hospital sparking a major incident, in Salisbury on March 9, 2018 in Wiltshire, England. Sergei Skripal who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010 and his daughter remain critically ill after being exposed to an 'unknown substance'. (Photo by Matt Cardy/Getty Images)
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Getty Images News Matt Cardy