http://www.foreignpolicy.com/articles/2013/04/09/i_met_with_unambiguous_failure_thatcher_gorbachev_germany

We are very concerned about the processes taking place in Eastern Germany. Some big changes could happen there, forced partly by the state of the society and partly by the illness of Erich Honecker. One example of this is the flight of thousands of people from the GDR to the FRG. All of this is on the surface, it is very important but even more important is something else.

The reunification of Germany is not in the interests of Britain and Western Europe. It might look different from public pronouncements, in official communiqu� at Nato meetings, but it is not worth paying ones attention to it. We do not want a united Germany. This would have led to a change to post-war borders and we can not allow that because such development would undermine the stability of the whole international situation and could endanger our security.

In the same way, a destabilisation of Eastern Europe and breakdown of the Warsaw Pact are also not in our interests. Of course, internal changes are happening in all Eastern European countries, somewhere they are deeper than in others. However, we would prefer if those processes were entirely internal, we would not interfere in them or push the de-communisation of Eastern Europe. I can say that the President of the United States is of the same position. He sent me a telegram to Tokyo in which he asked me directly to tell you that the United States would not do anything that might put at risk the security of the Soviet Union or perceived by the Soviet society as danger. I am fulfilling his request.