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The UK has described as "perverse" a Russian proposal for a joint inquiry into the poisoning of a Russian ex-spy and his daughter in England last month.
The comment came from the UK team as it attended an emergency meeting of the international chemical weapons watchdog, the OPCW, on the issue.
Russia, which called the meeting, wants the UK to share evidence.
The UK says Russia was almost certainly to blame for the attack but Moscow denies any involvement.
The British government says a military-grade Novichok nerve agent of a type developed by Russia was used in the attack on Sergei Skripal and his daughter Yulia in Salisbury, southern England, on 4 March.
The incident has caused a major diplomatic fallout, with the expulsion of about 130 Russian diplomats by the UK and its allies being met by counter-expulsions by Moscow.
(BBC)
