I think that's all been known for some time. They initially thought the soldiers had been killed (and this is what the Ukrainians announced), but it wasn't long afterwards when they announced that they might have been captured and survived, instead. The Ukrainians and the Russians have, I believe, engaged in regular prisoner swaps.
The Ukrainian announcements are usually the most optimistic possible interpretation of the truth - I don't think anyone really believes their casualty figures/announcements of how many tanks they have destroyed etc. to be entirely accurate but this is nothing new in warfare. Conversely, the Russian announcements bear only the most vaguest resemblance to the truth, and that's only if looked at in a good light.