Timothy Garton Ash is professor of European studies at Oxford University and a senior fellow at the Hoover Institution, Stanford University. Germany has a unique historical responsibility to help defend a free and sovereign Ukraine. Europe’s central power is also uniquely qualified to shape a larger European response, designed to end Vladimir Putin’s criminal war of terror in a way which also deters future aggression around places such as Taiwan. As a signal of strategic intent to measure up to this double obligation, from the past and for the future, the Berlin government should commit at the Ukraine defence contact...