They didn’t retire them early, but decided not to upgrade them. They where 40 years old and needed massive maintenance now.
Germany was highly dependent on russian gas with nuclear as well – even more, if you consider that Germany got its Uranium from Russia, too. Also Gas and Nuclear Energy fulfill a completly different function. Nuclear is not really flexible, so its a baseload source. Gas is highly flexible, which is the reason its a peak load source. Nuclear competes with renewables and a bit with coal, but not with gas.
No idea where you got this Fakenews, but no politican of the german greens was involved in any scandal with Russia – in fact its the opposite: they have been the most vocal anti-Russia party for years now and warned about dependence on Russia for the last decade already.