It doesn't matter much if the country that builds the power plant has a dictatorship or a democracy. Both political systems produced nuclear disasters.
The currently built VVER1200 NPP has pretty good safety:
https://en.wikipedia.org/wiki/VVER#Safety_features
There are a lot of these (especially the older version of VVER1200) reactors operating in the European Union. Some of them are not too far from international borders. I think a casual Russophobia is the main driving force of the opposing voices instead of actual criticism of the VVER1200. I am not sure if Russia would want to have another nuclear disaster by not taking nuclear safety seriously. It would be really bad for business.
Some places where these VVER blocks are operating or going to operate:
VVER power stations have been mostly installed in Russia and the former Soviet Union, but also in China, Czech Republic, Finland, Germany, Hungary, Slovakia, Bulgaria, India, and Iran. Countries that are planning to introduce VVER reactors include Bangladesh, Egypt, Jordan, and Turkey.
What is the scenario that could cause a catastrophic failure in the VVER design or implementation that would result in a disaster that would create a situation to evacuate cities 50kms away?
I am truly interested in this, because I though that VVERs where designed to avoid any sort of disaster. This is why these have a pretty reliable control rod system with safety factor of 5+ and the containment block can survive a Boeing 747 flying into it. Do you think there is a real change that the reactor going super critical and exploding?