Additionally, I have met people who believe that there are some secret diplomatic tricks to avoid wars. In reality, there are no such tricks. Peace does not depend solely on the skill of diplomats.
Why is neutrality impossible for Estonia?
There are only two arguments.
Geography makes it impossible
If the Russian general staff believes that NATO or any foreign power wants to attack Russia, they will conduct an exercise familiar to all military schools. They will look at the access routes to the target. Looking at the map, it is clear that to conquer St. Petersburg and Northwestern Russia, an opponent would use the territory of the Baltic states. This was the case in World War I and again in World War II. The same applies to conventional war scenarios now.
Leaving all ideology aside, the Russian general staff's conclusion is correct – to reduce military threat, they would need to control the Baltic states' "bridgeheads" and not let the «opponent» do so.
It seems that to ensure peace, all troops should be removed from the Baltic states, and all problems would resolve themselves. Unfortunately, this conclusion is wrong because it assumes Russia is always reasonable and good. Before World War II, Estonia was neutral, but the Soviet Union still occupied the Baltic states. Preemptively. As Soviet historians explained, it was necessary, among other reasons, to preempt the Germans. There is technical logic in this from the Russian military perspective. Unfortunately, this neutrality exposed the weak point in Estonia's defense logic. We decided to be neutral, considering Russia's legitimate security concerns. But did anyone consider the security of the Baltic states at that moment? Of course not.