It's released Ukrainian prisoners and begun talks with France. But it hasn't given up any of the territory it seized. (Picture: Relatives meet Ukrainian prisoners released by Russia. Credit: EPA)
Ukraine conflict
Officials hope the long-awaited exchange may help improve relations between the neighbours.
Read moreUkrainians freed as part of a prisoner exchange with Russia arrive home to ecstatic scenes.
Volodymyr Tsemakh is a potentially key witness to the downing of the Malaysian airliner MH17 in 2014.
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Viacheslav Shramovych
BBC Ukrainian
Some 400 troops died at Ilovaisk in 2014 when Ukrainian forces retreated through a "safe" corridor.
Read moreUkraine has been angered after the Russian leader visited a bikers' festival on the annexed peninsula.
Ukraine has been angered after the Russian leader visited a bikers' festival on the annexed peninsula.
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Some of the groups investigated in Italy are said to be linked to militia units in eastern Ukraine.
Read morePolice investigating far-right groups in northern Italy found a missile in a big arms cache.
Unexploded mines and rockets are one of the legacies of Ukraine's conflict with Russia-backed separatists.