Here is the break down ordered by approximate market share descending and the "country of origin":

  * Microsoft - US
  * Avast - Czech Republic
  * AVG -  Czech Republic
  * ESET - Slovakia 
  * Symantec - US
  * Avira - Germany
  * Kaspersky - Russia
  * Malwarebytes - US
  * McAfee - US
  * COMODO - US
  * Bitdefender - Romania
  * Panda - Spain

To be fair, Kaspersky does a pretty good job of reporting on even Russian originated banking trojans and the like.

F-Secure - Finland - https://www.f-secure.com/weblog/

And now I'm wondering, why isn't there an nation agnostic open-source antivirus ?

Oh, I almost forgot https://en.wikipedia.org/wiki/Clam_AntiVirus#Effectiveness

But it's not famous enough...

A dumpload of companies and media outlets immediately blaming NK for the Sony hacks. It's not Russia, but close enough.