Fun fact, the person responsible for this is a Russian asset, Gerhard Schröder (see 2002 Atomgesetz) and the purpose of the move was to ensure German energy dependence on Russia. He became chairman of the board of Rosneft and NordStream, and was about to join the board of Gasprom before the war started. He made tens of millions from Russian energy companies and pro-Putin lobbying. Lifelong friend with Putin, whom he lauded as a flawless democrat in 2004.

I should have said "most responsible" -- of course there is more than one person responsible. But it is an indisputable fact that Schröder is the single most responsible individual here, aside from Putin himself. Trittin, Merkel, and the Green party also have their share of responsibility.