Russia belongs to Asia and to Europe. I live in Yekaterinburg in the Ural and we are in Asia but the imaginary border on Europe is situated about 15 km to the west of my city. There are boundary posts for tourists where your right foot can stand in Europe and your left one in Asia. And you can say that Russia is the biggest country in Asia because 77% area of Russia (or 13.1 million km²) is in Asia.

Eurasia. And you can say that Russia is the biggest country in the world. :))))))))))

It is both, we call it Eurasia. http://en.wikipedia.org/wiki/Eurasia#Post-Soviet_countries But both culturally and politically, we can't think it apart from Europe.

It is one part of Europe.

Who cares!