Even Crimea itself is an example of stolen territory. It was part of Russia, until (Ukrainian) Khrushchev moved it under administration of Ukrainian SSR in 1954. It was excused as being in the same country anyway. When USSR dissolved, the Crimean referendum about returning it back to Russia was ignored by the newly-formed government in Kiev.
Bismark knew 150 years ago not to try to cheat the Russians. They will always come and take back, what's theirs.