Hungarian Prime Minister Viktor Orbán, the European Union’s longest-serving leader and one of its biggest antagonists, has taken a long road from his early days as a liberal, anti-Soviet firebrand to ...

Hungarian Prime Minister Viktor Orban conceded defeat today in a major election loss that will reverberate in Washington and Moscow.

Mr. Orban has often stood in the way of critical policy goals for the European Union, including blocking a loan to Ukraine and sanctions packages targeting Russia.