Is it really though? The biggest country in Europe is Russia, also the biggest population is Russians living inside Russia. Maybe you meant the EU which is far from being all of Europe. It is not even half of Europe. There are 23 countries out of 44 in Europe that aren't in the EU. If you talk law then a small detail like that matters a lot.
European Russia accounts for about 75% of Russia's total population. It covers an area of over 3,995,200 square kilometres (1,542,600 sq mi), with a population of nearly 110 million—making Russia the largest and most populous country in Europe.
European Russia covers the vast majority of Eastern Europe, and spans roughly 40% of Europe's total landmass, with over 15% of its total population, making Russia the largest and most populous country in Europe.
