The description for this photo said,
Anatoly E.Karpov, World Chess Champion and President of the International Foundations of Peace Association, gives a welcome speech.
What's that got to do with postage stamps?
The related photo album, 'Exhibition of postal stamps from the collection of the world chess master Anatoly Karpov', said,
Opening ceremony of the exhibition of postal stamps from the collection of the world chess master Anatoly Karpov and simultaneous chess game with 14 representatives from international organizations competing against Anatoly Karpov on 4 April 2017 at the Vienna International Centre.
As for UNIS, it stands for 'United Nations Information Service'.