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Moscow which never comments on identity of GRU staff has repeatedly denied any involvement in poisoning from which both 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