Russia and Ukraine's human rights commissioners are due to meet in Turkey later this week.
A Ukrainian news agency said Kyiv's expecting the - quote, "return of our heroes and heroines" - most likely a reference to a forthcoming prisoner exchange.
Moscow's commissioner didn't provide any details.
Stuart Smith reports from the Russian capital.
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Prisoner exchanges have happened before - most recently on Sunday. They usually include tens or hundreds of troops - usually 1 Russian for 1 Ukrainian.
This meeting will be a rare example of direct communication between both countries, which may signal a bigger exchange is being looked into, or that the way they take place is up for discussion.
Russia's human rights commissioner also commented on Monday about its use of criminals to fight in Ukraine.
She said that their release was all in accordance with the law - but is a state secret - meaning the details of the arrangement cannot be released.
The first group of prisoners recruited to fight in Ukraine are now free in Russia - having completed their six month contract - and with all criminal records cleared, according to the boss of the Russian paramilitary organisation - Wagner.
Stuart Smith, Moscow
Prisoner exchanges have happened before - most recently on Sunday. They usually include tens or hundreds of troops - usually 1 Russian for 1 Ukrainian.
This meeting will be a rare example of direct communication between both countries, which may signal a bigger exchange is being looked into, or that the way they take place is up for discussion.
Russia's human rights commissioner also commented on Monday about its use of criminals to fight in Ukraine.
She said that their release was all in accordance with the law - but is a state secret - meaning the details of the arrangement cannot be released.
The first group of prisoners recruited to fight in Ukraine are now free in Russia - having completed their six month contract - and with all criminal records cleared, according to the boss of the Russian paramilitary organisation - Wagner.
Stuart Smith, Moscow