No worries at all - sooooo, I've never been fined myself but the stories I hear vary from expat to expat. One refused to pay and got a 'black stamp' in their passport barring them from reentry for 6+ months.

Not wanting to speculate, I've looked up one source and it looks like the fine is between 850-1700 Ukrainian Grivna, which is currently trading at around 25 to the dollar: http://www.frishberg.com/index.php/en/newsletters/196-ukrain...