A rebel government official and the Ukrainian president’s office confirmed that the swap has started.
The last major prisoner swap between separatist rebels and Ukrainian forces took place in December 2017, with 233 rebels exchanged for 73 Ukrainians.
The fighting in eastern Ukraine since 2014 has killed more than 14,000 people. The conflict began about two months after Ukraine’s Russia-friendly president fled the country amid massive protests in Kyiv. Russia’s annexation of the Crimean Peninsula soon followed.
But prospects for peace are still troubled by questions over allowing local elections that would ensure the rebel regions more autonomy and about Ukraine regaining control of its border with Russia in the rebel areas.