[petard]

Some of these look like German WWII aircraft eg ME-163

[nixass]

Russians poached some German engineers as well, not only NASA

[jryle70]

The Soviets also transferred the entire rocket manufacturing line from Germany to USSR

http://www.russianspaceweb.com/rockets_ussr_germany.html

[inglor_cz]

And a lot of the documentation that was on the territory of the future GDR.