I never heard anyone doubt the geographical meaning of Europe. In geography, Europe is the continent delimited on the East by the Ural mountain and river, the Caspian Sea, and the Caucasus. (Check Wiki.) The cultural realm is another thing, but let me point at Turkey, another country mostly in Asia but partly in Europe, whose joining is also discussed.

The EU is yet another thing, where I must mention that the EU existed long enough on a much smaller part of Europe, and people in many of its members weren't exactly happy about some or all of the 'new members'. Furthermore, there are other international organisations - for example the Council for Europe, the OSCE, and of course the 'most important', UEFA (football) and Eurovision (silly song contest), both of which include both Turkey and Russia.

_{*Lunatic*, n.
One whose delusions are out of fashion.}