Hungarian Prime Minister Viktor Orban has warned that Ukraine's potential membership in the European Union could threaten Hungary's security and escalate the risk of conflict in the region.

Slovakia's Prime Minister Robert Fico's condition is "very serious" following an assassination attempt that has garnered international condemnation and shocked the nation, a government official has said. 

Pro-Russia candidate Peter Pellegrini wins Slovak presidential election.

A pro-Russian party wins general elections in NATO member state, Slovakia.

A populist party that wants to stop military aid to Ukraine and is critical of the EU and NATO has won Slovakia's election, results have showed.

Slovak voters began casting ballots in a tight early election seen as key to whether the country will keep supporting neighbouring Ukraine after a campaign marked by disinformation.

A drone strike has led to a massive fire at a fuel storage facility in the Crimean port city of Sevastopol, its governor says.