Czechs Blame 2014 Blasts at Ammunition Depots on Elite Russian Spy Unit

The unit has also been implicated in the 2018 nerve agent attack in Salisbury, England, on Sergei Skripal, a former Russian spy, and his daughter.

source https://www.nytimes.com/2021/04/17/world/europe/czech-republic-skirpal-russia-gru.html