> I also suspect that Russia has been causing the very problems that the far right reacts against, most notably immigration.

They absolutely are.

A large portion of immigrants into Europe originate from countries suffering from conflicts that Russia has a big hand in. The big one, of course, being Syria, but also many African nations where the Wagner group, now effectively re-branded as the Russian Africa Corps are providing military support and protection.

Another big aspect of Russia facilitating immigration into Europe, is the immigration route through Belarus: https://en.wikipedia.org/wiki/Belarus%E2%80%93European_Union...