His widow, Myroslava, told the BBC's Europe Today programme: "For me and Ukraine it's a very important step in bringing justice to my husband... and generally to society. It's a cleansing process.
"He knows the name of people who ordered the crime," she went on.
"The thing is, it's easy to mention names, but it's not that easy to collect all the evidence to present in court against instigators and organisers."
Secret tape recordings released soon after the killing appeared to implicate the then-President, Leonid Kuchma.
In the recordings - made secretly by a member of his personal guard and then released by an opposition politician - Mr Kuchma allegedly discussed ways of removing the journalist, with a former interior minister, Yuri Kravchenko.
The latter was later found dead and was said to have committed suicide.
Mr Kuchma did not deny the voice in the recordings was his, but insisted it was doctored to make him appear to say things he did not actually say.
The scandal prompted massive street protests against Mr Kuchma's government.
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