Interesting argument here in Winter tyres of which we should be aware of in the EU for example I think all comes down to countries that have extremely cold snowey winters In my 30 plus years experience of driving in Britain, I felt no need of changing my tyres.. But maybe it is different in countries such as Russia. But as long as someone stated that after heavy falls of snow , a good regular tyre might be sufficient, as long as we have a good service of those constantly salting the snow, Of which I think we do in Russia, and other countries such as Sweden and Norway. For UK having heavy freak snow ovr a short period of time? No we don't.
But as I said every country is different. Read this informative link. http://www.etyres.co.uk/winter-tyres-law