I mean a continent is definitely not and objective thing. I don’t know the Latin names for wolves and foxes but the distinction between both is 1000x more scientific than the idea of continents. Russia being and desperately trying to be considered part of Europe instead of Asia is not scientific.
Get out a map.
The continents are the huge land masses surrounded by giant bodies of water.
Get Europe out of your mind for a sec and now look. It's all very clear.
Europe is not its own continent. So Russia will always be in Asia as well as Germany and Italy.
Europe is just the West Coast of Asia, not a separate continent. How do I define continent? Get the map out.