Related: Britain Says No Russian Retaliation Justified

                Russian Lawmakers Slam British FM in Spy Row

Russia would offer a tough and adequate reaction to Britain's decision to expel four Russian diplomats, Deputy Foreign Minister Alexander Grushko said Tuesday.
　
He said the steps Britain is taking will heavily complicate bilateral cooperation in security issues.
　
"It is obvious that the line London is pursuing will complicate or make impossible cooperation between law enforcement bodies in issues relating to the safety of millions of British and Russian citizens," Grushko said.
　
He said Russia's response would be appropriate and targeted, adding that it would not affect ordinary people or businessmen.
　
On Monday, British Foreign Secretary David Miliband said Britain would expel four diplomats from the Russian embassy in London due to Russia's refusal to extradite a main suspect in the poisoning case of former KGB agent Alexander Litvinenko.
　
Andrei Lugovoi, also a former KGB officer, was accused of murdering Litvinenko.
　
Litvinenko died of radioactive poisoning, from Polonium 210, in London on Nov. 23. Experts investigating his death found radiation traces at a dozen locations and on two British Airways airplanes that flew the Moscow-London route.
　
Lugovoi, a business partner of Litvinenko, met him at a London hotel on Nov. 1. Litvinenko fell ill on that day and died weeks later in a London hospital.
　
On July 5, Russia's Prosecutor General's Office formally rejected Britain's request for the extradition of Lugovoi.
　
Russia has said its refusal was based on a constitutional ban on turning Russian citizens over to foreign countries, as well as a European convention that allows signatories to refuse to extradite their nationals.