For months, the European Union’s leaders have waged a fierce battle against Hungary’s Prime Minister Viktor Orbán. They have accused him of targeting minorities and opposition media, and threatened to withdraw Hungary’s voting rights in the E.U. Parliament, and to eject permanently members of Orbán’s far-right Fidesz party from the biggest political grouping in the legislative body in Brussels. Yet none of that has succeeded in softening Orbán’s views — far from it.