The rally began at noon, journalist Pavlo Sheremet wrote in Twitter, Censor.NET reports.
Belarusian volunteers hold a placard "We are patriots, not mercenaries" as well as Ukrainian and white-red-white flags of Belarus.
They demand to stop repression by the Belarusian authorities against volunteers who fight for the territorial integrity of Ukraine as well as to cease pressure on their relatives.
4,500 people protesting near Rada building in Kyiv, situation calm, - Kyiv Police Head Kryshchenko. PHOTOS(0)
Government block in Kyiv downtown closed, Rada building circled with two rows of National Guard and police, - MP Nayyem. PHOTOS(0)
Most recent detentions in Crimea are occupants' reaction to UN and EP resolutions, - lawyer Kurbedinov(0)