Ukrainian president addresses Bundestag via video, says Europe being destroyed, urges tearing down a new 'wall' that Russia is building between 'freedom and bondage'

At ceremony to mark 1989 fall of the wall, German chancellor says values of human rights and tolerance 'must be defended anew' and cannot be taken for granted

'We are in a competition of values with unfree nations,' US secretary of state says in Germany, cites Western 'responsibility to deter threats' from such governments

German startup offering visitors and history buffs an 'authentic' and immersive Cold War-era tour of the divided capital