World leaders back UK Novichok allegations
The US, France, Germany and Canada have agreed with the UK that the Russian government "almost certainly" approved the Novichok poisoning in Salisbury.
They have urged Russia to provide full disclosure of its Novichok programme.
The joint statement comes as the United Nations Security Council meets to discuss the attack on former Russian spy Sergei Skripal and his daughter Yulia in March and its fallout.
Russia has continued to deny any involvement.
The UK has named two men believed to be from Russia's military intelligence service, the GRU, as the main suspects.
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