Russia tells the UK that they can throw temper tantrums and allegations as much as they want and that Russia is calmly watching this nonsense.
Summary:
Russian state TV says, Skripal (sounds Russian) has been a traitor to his country. Being a traitor to one's country (Russia?) can be deadly, if said traitors chose to live in the UK.
Sergei Skripal has been part of a spy swap with the US seven years ago.