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Moscow which never comments on the identity of GRU staff has repeatedly denied any involvement in the poisoning from which both Skripals recovered PositiveSOFIA Bulgaria is investigating a possible link between a nerveagent attack on a former Russian spy in England in 2018 and the poisoning of an arms dealer in Sofia in 2015 http://www.reuters.com/places/russia/article/us-britain-russia-bulgaria/bulgaria-examines-possible-link-between-skripal-sofia-poisonings-idUSKCN1Q01AF2019-02-12