On the contrary, it was Bismark's successor who wrecked the private non-aggression deal between Russia and Germany by initially agreeing to its continuation and then suddenly pulling out. Bismark succeeded in diplomatically isolating France, his successors succeeded in uniting France first with Russia and then with the UK.
Robert Massie's book "Dreadnought" does a thorough and impressive job of explaining the long background to the tragedy of WW1.
> it was Bismark's successor who wrecked the private non-aggression deal between Russia and Germany by initially agreeing to its continuation and then suddenly pulling out.
They pulled out because it was doomed. Germany had to choose between Russia and A-H, and that choice was made well before Bismarck's retirement, at least since the Berlin conference.
From that point, the Russian-German alliance was a walking-dead. There are russian sources citing frustration and depreciating the alliance before Germany formally broke it.
Robert Massie's book "Dreadnought" does a thorough and impressive job of explaining the long background to the tragedy of WW1.