In Washington I organize a monthly Ukraine policy forum, In June of this year, a few months ago now, the former ambassador to Ukraine, Steven Pifer, in an off-the-record meeting, suggested that it's time the west leaked potential ideas for visa blacklists. They don't have to be concrete lists yet, but you can imagine that the impact of such a potential visa blacklist would be massive in Ukraine.
The west has far greater potential leverage over Ukraine than Belarus, because in Belarus there are no oligarchs. There are no people with huge houses in London, but in the Ukraine there are. These oligarchs are the main financial and political base of Viktor Yanukovych. If they begin to rebel against him, he's had it.
I think it needs to be a coordinated response to the effect that Canada, the U.S., and the EU will be participating. It doesn't have to be real yet, but if it's just leaked that we are discussing this possibility, it would have a big impact.