Russia has refused to extradite businessman Andrei Lugovoi to stand trial for the murder of former Russian security officer Aleksandr Litvenenko, on the grounds that its constitution bars the extradition of Russian citizens. The dispute has led both countries to expel the other's diplomats.
In the latest escalation, Putin said it had been disrespectful of Britain to suggest Russia amend its constitution, saying London should instead "change its brains."
On July 23, British Foreign Secretary David Miliband indicated that Russia's actions in this case have wider ramifications, which must be reflected in its relationship with the entire EU.
(Reuters, ITAR-TASS, Interfax, AP)