Lots of negotiation and paperwork and publicly recorded votes on both sides favoring approval.
The Russian claim that this was an annexation only flies if the Russians are asserting that East Germany was never a real state of its own in the first place and that their legislature, therefore, had no authority to enact such a treaty. While arguably correct on one level there are too many public assertions regarding the "independence" of Warsaw Pact nations by the Soviets to make this argument readily acceptable.
Writ large, the Russian claim is based on Hungary and Czechoslovakia having been Soviet responses to "internal" dissent -- they had a right to squash them because they were REALLY just provinces -- and that the "province" of East Germany really still belongs to Russia as the inheritor of the Soviet Union.
In short, this is just political theater.
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