"It's so important to keep his voice alive, whether it’s [through a] documentary, or whether it’s [through a] drama, but he will be alive, with us, and his message, finally, will be heard. Anything that I could use, I tried to do," she said.
Litvinkeno, who described Tennant and Levieva's performances as "absolutely amazing", added: "Watching his episode, it wasn't easy. But I realise with this drama, [there] will be more understanding for what happened.
"There’s still some questions [from people]. ‘Are you sure it's happened like this? Are you sure he was poisoned?’ – when they watch this episode, I think more and more people will realise what happened."
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Ever since her husband's death from polonium poisoning in November 2006, Litvinenko has met with several politicians in her search for justice.
"I talked to many [politicians]," she explained. "I have respect for some, I have a lot of critical opinion to others. But I believe they must watch this.
"This is not only political story, it's not only crime, it is absolutely [a] human story. It's a story of love. It's [a story] of hope."
Additional reporting by Morgan Jeffery.
Litvinenko arrives on ITVX as a full boxset on Thursday 15th December. For more news, interviews and features, visit our Drama hub, or find something to watch now with our TV Guide and Streaming Guide.
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