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I am not going to discuss you the achievements of Germanyn regarding the end of European Communism, and even the important East German demonstrations for freedom. Do you think that Reagan had the right to do what he wanted with Germany? Heck, if the Left had been in power here, Germany would have become a nuclear-free zone, and the wall would probably still divide the city of Berlin, the nation, the Europen continent, and the planet.

If economy were decisive for the crush of regimes, why is N Korea still communist? Why isn´t Cuba free at all?

You are still up? It should be bedtime?:)
I guess I will answer those questions I posed for you.
The Soviet Union collapsed mainly because of Reagans Military spending . They saw that they could not keep up and the country became poorer and poorer. In the foreseeable future there would have been a revolution.
When the Soviet Union disintegrated was not in '89, but many years prior to that. East German protests came long after that.
I am not saying that Kohl wasn't an enabler toward that noble cause, yes, he was. But his influence on the international stage was rather limited. After the collapse, it was "KOHL TIME".
In this case, military spending, causing an economic collapse was the nemesis of the Soviet Union.
You can't even compare N. Korea and Cuba. They are so isolated that very little is known by the general public. "Knowledge is strength" for an oppressed People.

Your reasoning is that of a Judge sentencing a murderer and then taking credit for the apprehension, trial and conviction himself.
Apprehension would have been done by law enforcement, trial by prosecutors, judgement by a Jury and pronouncement by the Judge.
In my opinion Kohl was like the Judge in this situation.