Nationalist Hungarian Prime Minister Viktor Orban faces a tough challenge with a united opposition in an unpredictable general election being held today, after a campaign dominated by Russia's invasion of neighbouring Ukraine. The six main opposition parties are for the first time fielding a joint list, determined to roll back the "illiberal" revolution Orban's Fidesz party has pursued during its 12 consecutive years in office.

Government spokesman Zoltan Kovacs says a definitive picture of results will likely only emerge between 11:00 pm and midnight. More than 200 international observers are monitoring the vote for the first time.