"Mr Gorbachev tear down this wall"  
Former US. President Ronald Reagan (1987)

"The Wall was not brought down by Washington Bonn or Moscow..."   
Former German Chancellor Gerhard Schröder (1999)

"I would build a great wall and nobody builds walls better than me believe me and I'll build them very inexpensively. I will build a great great wall on our southern border and I'll have Mexico pay for that wall." 
US President Donald Trump (2017)

"We don't want a united Germany. This would lead to a change to postwar borders and we can not allow that because such a development would undermine the whole international situation and could endanger security".
 Former British PM Margareth Thatcher (1989)

"It was the political choice of the people of Russia that enabled the then leaders of the USSR to take decisions that eventually led to the razing of the Berlin Wall." 
President of Russian Federation Vladimir Putin (2001)