The widow of poisoned former Russian agent Alexander Litvinenko applauded the British government's announcement to open a public inquiry into her husband's mysterious death.
Ms Litvinenko said the decision proves that "you are able to get justice in any difficult situation."
"I do this not against Russia or England, I do this for justice. I do this for truth," she said.
The decision, which comes at a time of rising tensions with Russia, is a breakthrough in the much-delayed probe because it means investigators can look into whether the Russian state was involved in Litvinenko's death.
A former officer in the Russian intelligence service, Alexander Litvinenko fell out with the Russian government and became a strong critic of the Kremlin.
He came to Britain in 2000 and obtained political asylum and died in 2006, aged 43, after drinking tea laced with polonium-210 at a London hotel.
On his deathbed, Litvinenko accused Russian President Vladimir Putin of being responsible.
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