US President Joe Biden made a forceful plea for the defence of democracy on Thursday at a ceremony to mark the 80th anniversary of the Allied invasion of France on June 6, 1944. “We know the dark forces that these heroes fought against 80 years ago – they never fade,” Biden said at a ceremony at the American Cemetery in the northern French region of Normandy, as D-Day veterans, some over 100 years old, looked on. “Aggression and greed, the desire to dominate and control, to change borders by force — these are perennial. The struggle between dictatorship and freedom is unending.” “Here in Europ…