Russian nuclear is ~17% (compare US at 19%). Overall it is slightly less CO2-intensive than the US, as it uses less coal. They have almost as much hydroelectric power as the entire US renewable sector.
Might be more, but it's still a minority of their grid. Wikipedia has a graph for 2016: 18.1% nuclear, 47.9% natural gas, and 15.7% coal.[0]
"Energy Matters" says that EU energy production was 26% nuclear in 2015, but only 12% for consumption[1], so I'm not sure how to look at that comparison. Either way, that's probably mostly France (~80%[2]). US around 8-9%[1].
TL;DR: Yes, most western countries probably have less nuclear, but it's a low bar.
