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In evening sun beams (134)
Alex99 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4072 W: 133 N: 7096] (23735)
This is definitely one of the species of Melanargia Meigen:

Kingdom: animals
Phylum: Arthropoda
Class: insecta
Order: Lepidoptera
Family: Nymphalidae
Subfamily: Satyridae
Genius: Melanargia Meigen.
Species: ?

There are many species in this Genius. See, for example: Melanargia Meigen or Melanargia.

More info about Melanargia Meigen you can find Here.

I have spent inadmissibly a lot of time in searches of exact ID, however these searches have not given a result. I have absolutely become puzzled in a variety of similar species. However, I am assured that this question will be quickly solved by joint efforts.

In this picture, the pose of the butterfly is not the most expressive, but my attention has been attracted by unusual illumination of the butterfly - back light.

For exact identification of species of this butterfly, I have shared my WS, which presents the same butterfly at more regular lighting.

Thank you for visiting.
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Our charming couple, experts on butterflies Ulla and Ivan Kruys (Uleko and Argus), have come to conclusion, that this species is Melanargia russiae Esp. As a Russian man, I accept this conclusion willingly.

About Melanargia russiae see:
Melanargia russiae Esp. (Russian)
Melanargia russiae

Ulla and Ivan! Thank you for your knowledge and help.
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My dear friend Peter Stoeckl (peter_stoeckl ) holds other opinion. He believes, that this butterfly is the Melanargia galathea. I am very grateful to Peter for the valuable information and remarkable comment.

I only can add, that Melanargia russiae meets in Ukraine very seldom. At the same time Melanargia galathea is everywhere widespread in our edges (see: Complete list of Ukrainian butterflies with old IUCN* and national threat status categories.).

I am very satisfied by this discussion. It is very useful and interesting. Many thanks to all my friends.

Altered Image #2

Alex99 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4072 W: 133 N: 7096] (23735)
Balancing Act...
Edited by:Shoot_Score Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 445 W: 302 N: 670] (2376)

The leftside of the flower is OoF in the lower part. Rather than using a straight crop to remove / reduce the OoF part, I used rotation...
I then did a sharpening on the new rotated photo.

Altered Image #1

Alex99 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4072 W: 133 N: 7096] (23735)
Another view
Edited by:Alex99 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4072 W: 133 N: 7096] (23735)

Another view of the same butterfly. Shared for definition of its species. Can you help?