This weekend, Belarus forced a passenger plane en route from Lithuania to Greece to make an emergency landing in Minsk.
After the plane landed, a regime critic who was on board the plane was arrested.
Several EU countries, like the United States and NATO, have condemned Belarus' actions.
Tonight, the leaders from all 27 EU countries will meet.
Among other things, possible sanctions against Belarus will be discussed.
Lithuania demands sanctions
There have been demands from several quarters to impose further sanctions on the country.
"We are working with international partners to close the airspace over Belarus for international flights," Lithuanian Prime Minister Ingrida Simonyte said ahead of the meeting, according to Reuters.
Simonyte has also demanded that the European Investment Bank not participate in projects financing the Belarusian government.
Belgian Prime Minister Alexander de Croo has also said that sanctions against Belarus should be tightened and that he hopes that the EU countries will quickly agree on the issue.
Löfven: Terrible action
Their Swedish colleague, Prime Minister Stefan Löfven, explained in a consultation with the EU Committee in the Riksdag that the EU intends to give a sharp reaction to Belarus.
- This horrible action must have consequences, said Löfven and received full support from the board.
All tools are on the table, according to Löfven: it can be a ban on overflights or sanctions against those involved.
Nothing is excluded in the light of the fact that it was an "unlawful and completely unacceptable act in violation of international law".
Ambassador called
Earlier on Monday, the EU called on Belarus' ambassador to Belarus, writes Reuters.
At the meeting, EU representatives stated that the Member States condemned the action and demanded that the acclaimed regime critic Roman Protasevich be released immediately.
The EU summit begins at 7 pm tonight.