1. https://en.wikipedia.org/wiki/Gerhard_Schr%C3%B6der#Criticis...
https://en.wikipedia.org/wiki/Anti-nuclear_movement_in_Germa...
All Russia had to do is use their unlimited money (from selling gas to Germany) to buy some influence in German news papers (difficulty level: easy) and maybe pay some people to organize protests.
Of course the fact that Russians bought Schroder isn't even speculation (unlike the above). To me the above is extremely likely to have happened (and probably still on-going).
Even in the early days of Putin's war Germany was still sponsoring Putin by buying many 100's of millions of EUR of gas from him.
They "got rid of Russian dependence in the energy sector" by reopening old German coal mines, firing up coal power plants and shifting gas imports from Russia to the US + importing tons of nuclear energy from France.
Germany only stopped buying Russian gas for > 50% of their energy needs AFTER a war started AFTER the pipelines to Russia got bombed and AFTER they had no other choice.