What is the truth of President Putin's non appearance?

Having read that Putin is not now engaging with President Zelensky in what were hoped to be peace talks, it did cross my mind that he may be too unwell. There has been much speculation over past years that he has Parkinson's, among other serious diseases, and it has been suspected that body doubles have taken his place at some events where he has been viewed from a distance. It does seem a drastic measure to not appear at these talks - or perhaps he is demonstrating his contempt.