It begs the question why you allow the Ukraine access to your site? They're no better than Romania, Russia and China for bad traffic.
Hmmm... I have Ukrainian friends and have had many Ukrainian students in my classes. You can't blame the Ukrainian people for what a few bad agents do... just as I hope they don't blame me for all the USA hackers, plagiarists and thieves.
Just a FYI, the request for u12Bot was blocked with a 403 server response, but not simply because it was Ukrainian.