Former Soviet president Mikhail Gorbachev (left) with former German foreign minister Hans-Dietrich Genscher in Berlin

Former president of the Soviet Union Mikhail Gorbachev (left) walks arm-in arm with former German foreign minister Hans-Dietrich Genscher at a Berlin Wall memorial event in the city. World leaders, past and present, have gathered for the 20th anniversary of the fall of the Berlin Wall, with 100,000 people expected at celebrations to toast a united Europe.
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