That is misleading data, because it ignores all the mass killings committed with knives in those other countries.

BTW, I'm from Russia (though I don't currently live there), and I can tell you that the overall violent crime rate is about twice that of the US, but again, the actual numbers aren't going to be nearly as high on account of the fact that Russia has about half the population. Furthermore, what is true of school shootings in Russia is also true of school shootings in the US: nine times out of ten, the perpetrator is a dejected young man who was failed by the system but had no prior criminal record, hence no-one was watching him.

Another thing to keep in mind is that Russian state media doesn't sensationalise mass murder the way that western media does. In fact, it's so rarely reported on that you have to do a lot of digging to find out about it. According to the Russian government, we don't have half the problems that we actually do.