Russia's home power (like most of Europe) is 230 vac, single leg to ground...at 50Hz.
is that combination potentially more lethal for the heart than,say,120 vac @60Hz...? How so?
50 or 60... Your heart has a hard time beating 50 or 60 times a second. It would rather just take a time out at that point. LOL
Amperage is what cooks or burns holes through you, but even low amperage can kill because the electrical system of the heart can get interrupted.