It used to be that way, but Ukr border control has instituted a '90 out of every 180 days' rule. You can get around that with a proper business visa (usually granted for 1 year), or by using two passports, or by paying a fine upon leaving the country if you overstay.

How much is the fine roughly? Sorry for the persistent questions but this is the most interesting one so far.

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...