Answer: gorbachev

AnswerCrossword Clue
GORBACHEV

"Peace is not unity in similarity but unity in diversity." (1990)

GORBACHEV

He instituted glasnost

GORBACHEV

Whom Reagan told to "tear down this WALL"

GORBACHEV
Soviet president when the Berlin Wall was dismantled
GORBACHEV
Reagan told him "Tear down this wall!"