The same happened with communist parties funded by URSS at the time, and it is still happening with some parties openly supporting Putin.
In the end the blame goes to thee people for being so gullible to vote for parties that do the interests of foreign powers. US, Russia, (China?), doesn’t really matter.
I say that, before Trump’s mess, in the EU we didn’t care much about what happened in the US or the decision that were taken there, except for wars or exceptional events like 9/11. Am I wrong?