Final answer:
A) Strengthened regional stability.
The 1990 Mutual Non-Aggression Pact primarily strengthened regional stability by preventing signatories from engaging in military aggression against each other, thus reducing military tensions and possibly enabling increased cooperation.
Step-by-step explanation:
The 1990 Mutual Non-Aggression Pact aimed to reduce the likelihood of conflict between the signing parties and promote peace and cooperation. One critical impact of such agreements is often the strengthening of regional stability because they actively prevent signatories from engaging in aggressive actions against one another. This typically lowers military tensions in the regions concerned and can also pave the way for enhanced cooperation in other areas, such as economics and politics.
In the context of the post-Cold War period, non-aggression pacts can be interpreted as a continuation of the efforts to ensure peace and stability following intense periods of rivalry and to avoid a re-escalation of tensions.
Historical examples illustrate that military alliances can either deter aggression or magnify conflicts. Still, the goal of non-aggression pacts like the one in 1990 is commonly to prevent further military engagements and thus support stability, either within a region or globally, which can be seen as an overarching theme in the efforts of nations emerging from conflict.