Analysis: Russia-West tension may worsen

The diplomatic struggle over Russia's refusal to extradite the man suspected in the poisoning death of a former KGB agent in London could hamper progress on an array of issues critical to the West.

After Britain ordered on Monday the expulsion of four Russian diplomats to pressure Moscow, Russia retaliated in kind against four British diplomats, suspended counter-terrorism cooperation with Britain, and probed the limits of British airspace with strategic bombers. (AP)