Every century or so, the rulers of Europe like to unite to take on Russia. The past teaches them nothing because they are too narcissistic and too ideological to see that they are the ideological heir of Napoleon and Hitler (and many others before these two).
[thesaker.is]
The last successful conquest of Russia was under Kubalai Kahn, the general and heir to Gengis Kahn. The Russians learned a thing or two about defending the Rodina from invasion.