>>/21782/
Ofc Lebensraum wasn't a new idea the national socialists come up with but older, but it wasn't achieved, surely not from the NSDAP and it's leaders' viewpoint.
In the Mein Kampf (I can't give you exact page number, I have a Hungarian edition, it's in the 14th Chapter, about the eastern politics, I see a subtitle here: "Eastern Politics again, after 600 years") Hitler declares that they have to secure arable lands for the German people and he points to Russia. He literally names her as the land where they have to take over from the Jews which lead her and secure it's soil for the new German leading stratum, which build those countries (which then belonged the the SU) in the past with the workforce of the Slavs.
>>/21786/
They thought the politics of the 2nd Empire faulty. Source: same as above (Mein Kampf, 14th Chapter abour the eastern politics).