The suspects of the 2018 novichok nerve agent poisoning of Sergei and Yulia Skripal in Salisbury, England, have been linked to a 2014 blast in the Czech Republic that killed two people.The suspects of the 2018 novichok nerve agent poisoning of Sergei and Yulia Skripal in Salisbury, England, have been linked to a 2014 blast in the Czech Republic that killed two people.