It's a little bit strange that Germany, modern and advanced with the meta-diplomacy of lobbyists and care-taking, does little to recognize violations of sovereignty on its own soil, real or suspected.
Unlike in the West (where NATO allies seem content to allow the Americans to keep watch), military operations in the lands of East Germany are strictly limited to German activities, without special and rare credentialing. The treaty's drafters argue that there was also the sub-text that the influence of NATO would advance no further east, nor the Warsaw Pact further west, as well—though that condition is placed in a dubious position with the expansion of the alliance to many former Soviet bloc nations (after the union's dissolution, having over-extended its resources in Afghanistan as part of the reason) and hosting multinational training exercises on the Baltic and the build-up of Leipzig airport to handle air-force traffic.