Chancellor Angela Merkel led a series of commemorations in the German capital over weekend to mark the 30th anniversary of the fall of the Berlin Wall, which divided the city during the Cold War until 1989. The wall was built by Communist East Germany to prevent its citizens fleeing to the capitalist west. As Henry Ridgwell reports, the hope and optimism in the years following the wall’s destruction have been replaced with fears over the resurgent tensions between Russia and the West