Britain invented the Skripal case to distract attention from Brexit.
Conspiracy theory. Recurring pro-Kremlin disinformation on Salisbury attack. euvsdisinfo.eu/disinformation-cases/?text=skripal&disinfo_issue=&date= and connecting Skripal poisoning with Brexit. euvsdisinfo.eu/disinformation-cases/?text=skripal+brexit&disinfo_issue=&date= Many competing and contradictory stories promulgated by Russian state-controlled media on the Skripal poisoning https://euvsdisinfo.eu/disinformation-cases/?text=sergei+skripal&disinfo_issue=&date=
On September 5, UK counter-terrorism police released images of two suspects in connections with the Salisbury attack. news.met.police.uk/news/counter-terrorism-police-release-images-of-two-suspects-in-connection-with-salisbury-attack-320534, www.bbc.com/news/uk-45421445
On September 6, France, Germany, US and Canada stated that they have full confidence in the British assessment that the two suspects were officers from the Russian military intelligence service, also known as the GRU, and that this operation was almost certainly approved at a senior government level. www.gov.uk/government/news/salisbury-attack-joint-statement-by-leaders-of-france-germany-the-united-states-canada-and-the-united-kingdom
On Sunday 4 March Sergei and Yulia Skripal were poisoned in Salisbury with a military-grade nerve agent of a type developed by Russia. As for the scar on her throat, news outlets, including the BBC and Telegraph, have described it as a result of a tracheotomy, a surgical procedure which opens a hole in a person's windpipe to help them breathe. She has not shared specifics of her treatment, but described it as "invasive, painful, and depressing." http://uk.businessinsider.com/skripal-poisoning-yulia-skripal-neck-scar-hints-at-painful-recovery-2018-5?r=US&IR=T
For the UK response see: https://www.gov.uk/government/news/novichok-nerve-agent-use-in-salisbury-uk-government-response
The OPCW have confirmed the UK findings in the case. "The results of the analysis by the OPCW designated laboratories of environmental and biomedical samples collected by the OPCW team confirm the findings of the United Kingdom relating to the identity of the toxic chemical that was used in Salisbury and severely injured three people." https://www.opcw.org/news/article/opcw-issues-report-on-technical-assistance-requested-by-the-united-kingdom/