For the past 25 years, the Poles were told that the new Germany would have their back. After German unification and the eastward expansion of the EU and NATO, as the reassuring slogan went, "When Germans now look East, they see the West"—namely Poland. Germany trades and invests more with Poland than with Russia. Yet Berlin's present approach evokes the memory of a Germany that once carved up Central Europe with Russia. No one's talking of another partition of Poland, but it's sobering to hear Polish officials grumble more about Berlin than about Moscow.