She [Margot Wallström, Swedish Foreign Minister, commenting on Russia’s statement that Sergei Skripal was poisoned by the nerve agent produced by Sweden] says: ‘These unfounded accusations’ … assuming that if someone accuses somebody of something, he should justify this accusation with something. But after all, she is also a part of that West, which does not consider it necessary to do for us.
The Minister of Foreign Affairs of Sweden has rejected the Russian accusations, and so did the competent authority on the topic in Sweden (the Swedish Defence Research Agency). https://www.svt.se/nyheter/utrikes/ryssland-giftet-som-anvandes-mot-skripal-kan-ha-kommit-fran-sverige Later on, the Russian ambassador to Sweden stated that it was "a guess" without any facts supporting it https://www.svt.se/nyheter/utrikes/ambassadoren-backar-efter-giftutspel
Many competing and contradictory stories promulgated by Russian state-controlled media, the only connecting thread being to confuse their audience and exclude any possibility of Russian involvement. https://euvsdisinfo.eu/disinformation-cases/?text=sergei+skripal&disinfo_issue=&date=
The nerve agent has been identified as Novichok (which means newcomer in Russian). It is known to be more powerful than VX and was developed in Russia in the 1970s and 1980s. https://www.voanews.com/a/british-prime-minister-russia-poisoning-spy/4294683.html It's so unusual, that very few scientists outside of Russia have any real experience in dealing with it and no country outside of Russia is known to have developed the substance. https://edition.cnn.com/2018/03/13/europe/what-is-novichok-nerve-agent-intl/index.html, https://theconversation.com/what-we-know-about-novichok-the-newby-nerve-agents-linked-to-russia-93264
In its statement, the European Union expressed shock at the offensive use of any military-grade nerve agent, of a type developed by Russia, for the first time on European soil in over 70 years. http://www.consilium.europa.eu/en/press/press-releases/2018/03/19/statement-by-the-foreign-affairs-council-on-the-salisbury-attack/