Kiev marks 35th anniversary of the world's worst nuclear accident while releasing a cache of archive documents suggesting that Soviet authorities hushed up at least three accidents at the plant in 1982 and 1984.
The exchange was facilitated by Russian peacekeepers who have been deployed to Nagorno-Karabakh for five years under the peace deal.
Yuri Dmitriev's real crime, according to activists, was dedicating himself to documenting Stalin's 1937-38 Great Terror and discovering a mass grave with up to 9,000 bodies dating from the period.
China seeks to increase ties in the ex-Soviet Central Asia region which Russia has traditionally viewed as its backyard.
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