Like carve out a place between Russia, Belarus and Ukraine in the former Pale of Settlement. Establish a bunch of Yiddish language schools there. Have it become a center of Jewish culture. Sure, there are already Ukrainians, Russians and Belorussians there but there were already people in the far east too.
This is my fault. In wikipedia it goes.
geez he seems like a super complicated figure. Guess its expected from the top spy of the USSR