Zelenskiy, a comedian with no prior political experience, won the presidency by a landslide last month but his new party has no representation in parliament, making it expedient for him to call a snap poll while his popularity remains high.
More than 400 million Europeans are heading to the polls this week in all 28 EU countries to elect 751 members of the European Union Parliament to new five-year terms.
Many see the elections as a referendum on President Duterte's unorthodox leadership style and his rise to power with a brutal crackdown on illegal drugs that has left thousands dead.
South Africa's national elections are a test for the ruling ANC's popularity, 25 years after the start of democracy.
The African National Congress, the party of Nelson Mandela, which has been in power since 1994, is likely to win a majority but will face a difficult challenge to match the 62 percent of the vote that it won in the previous election five years ago.
Polling stations opened at 0700 GMT and will close at 1800 GMT, with results announced later Sunday.
India is home to the largest population of illiterate adults in the world; how do they recognise the parties they vote for at the ballot box?
Algeria’s fate is clouded with uncertainty as unseen forces within its ruling elite battle for supremacy, while doing their best to survive the continuing calls for meaningful change across the country.
AK Party will appeal to the country's Supreme Election Council for a full recount of votes in all 38 districts of Istanbul.
The local elections were carried out in 81 provinces and almost 1,000 towns throughout the country.
The top three contenders in Ukraine's presidential elections cast their vote on Sunday in a first round which a comedian - who happens to play a fictional president in a popular TV series - is tipped to win.
High voter turnout in local elections can demonstrate that the Turkish people are deeply invested in their democracy.
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