He puts one of your men in the hospital, you put one of his in the morgue. He puts one of your men in the morgue, you expel four diplomats ...
The poisoned spy murder case has grown into a Cold War stand-off after Britain announced the expulsion of four Russian diplomats.
Britain also said it would suspend visa negotiations in retaliation for Moscow's refusal to extradite chief suspect and former KGB agent Andrei Lugovoy over Alexander Litvinenko's death.
The Russian Foreign Ministry said the UK's actions were "immoral" and would have serious consequences.
No word from the Russian Foreign Ministry regarding the morality or "unserious consequences" of simply ignoring the murder of Putin critics in London by polonium poisoning.