Ukraine and Poland are among the countries stopping all flights to and from Belarus. Meanwhile, the UK is preventing Belarusian airlines from entering its airspace.
Air France and Finnair have both announced they will suspend flights to the country. KLM Airlines, Lufthansa and SAS have also announced similar suspensions. Singapore Airlines is also now saying it will reroute flights to avoid Belarus.
Some 400 flights use Belarusian airspace daily and 100 of these are by EU or UK carriers.
The 26-year-old Belarusian journalist and activist Roman Protasevich is a vocal critic of his president and his regime.
Earlier this week, Belarusian officials pulled Protasevich from the Ryanair passenger plane.
In a statement, Ryanair says Belarus air traffic control informed pilots of a “potential security threat onboard.” Air traffic control allegedly ordered the airline to make an emergency landing.