"Those who have valid passports and wish to transit Ukraine for a period of up to 90 days..."

OK, so what is the definition of 'transiting Ukraine?'
It can't mean just passing through on the way to somewhere else, since it states 90 days.  A person in decent shape could probably walk across Ukraine in less than 90 days.

So why can't any US citizen who wants to visit Ukraine for up to 90 days be in the 'transit' category.  This would eliminate the necessity for a prior visa within a 6 month time period.

I already have a 5 year multi entry visa, so no consequence to me either way.

But curious anyway to know why everyone from USA could not fit into the 'transit' exception.