Well, at least gives us clues about what may be and which are less likely.
In my case, Tenebrionidae fail a lot, for example, but it is a good website supported by European experts who work with their reviews. Other sites dealing with specific groups, but usually try to countries or regions.
I remember seeing P.V. Putshkov, famous expert in Heteroptera. In Miridae, the reference is the work of Kerzhner IM, M. Josifov (1999) although there are many updates to other experts.

By!!

Yes, I know about this site. But I'm not sure that there is objective information on Miridae for Ukraine.

Oh, I see :)
I use this web:
http://www.faunaeur.org/
I think you already know, don't you?

Well, It's sure Acetropis sp.

Ciao!!

I not have Miridae-reference for Ukraine, and I do not know ... Them very much. :)

I'm sure it's Acetropis longirostris.
I Ukraine are three species:
Acetropis (Acetropis) carinata (Herrich-Schaeffer 1841)
Acetropis (Acetropis) gimmerthalii (Flor 1860)
Acetropis (Acetropis) longirostris Puton 1875
I konw Acetropis carinata and Acetropis gimmerthalii and I can assure you is not one of them, because this guy has the black antennae.
What do you think?

Ciao!!