[Ursus Maior]

I fully concur with B.T.

Germany and German politics just didn't operate that way. There was no way to move troops at brigade level and above without NATO knowing and approving. Also, there was a strong sense of "never again" in the sense of never again showing aggression or use force as the first party. It's not only a cultural thing, but also a thing of political and military doctrine and actual law (it's in the constitution!).

So, bottom line is: If the Bundeswehr moves, its moves are sanctioned by the Western allies. I would even add: it would never move alone. First of all, Bundeswehr logistics and force posture wasn't made for large scale operations withouth NATO support, most certainly no into an Easterly direction (aka "offensive"). And besides this technical point, German leadership would simply refuse to order their troops to act in such a manner, unless their allies would move with them.

Three reasons for that: 1) It looks aggressive on a political scale, both on the international scale and in domestic politics. As established, Germans wanted never again to look like or be the aggressor. This went so far as for active duty soldiers to resign or refuse orders in all major deployments since Desert Storm. The German populace would immediately begin large scale demonstrations.

2) Such a move is high risk on a strategical scale. Breaking the Inner German Border means de facto attacking Soviet forces. Without nuclear cover - aka "going solo" - that's tantamount to sacrificing troops to Soviet nuclear strikes, at least in theory.

3) This means risking full nuclear war. Why would the allies support a move, but not follow through with it themselves and thus increase the threat of nuclear war.