The European Court of Human Rights has issued a ruling saying Russia was responsible for the 2006 assassination of former Russian security officer Aleksandr Litvinenko in London.
Litvinenko died an agonizing death after he drank tea that was poisoned with polonium-210, a rare radioactive isotope.
Litvinenko fell ill on November 1, 2006, and died several days later.
This is a developing story.
More to follow.