To navigate the dangerous new era, Keir Starmer must end the culture of denial around the biggest strategic mistake of modern times

The 35th anniversary of the Berlin Wall coming down was not commemorated much in Britain last weekend. It is no Poppy Day. The unravelling of the iron curtain doesn’t compete with Remembrance Sunday for cultural resonance. But it is more relevant to the world we live in today. More poignant, too, now that Americans have chosen a president who is no friend of what used to be called the west .

Few world leaders will be gladder to see Donald Trump return to the White House than the former KGB officer who sits in the Kremlin, craving vengeance for his Soviet motherland’s humiliating defeat in the cold war.

Rafael Behr is a Guardian columnist