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.
Relatives of Ukrainian hostages held by Kremlin picket Ukraine-EU Summit with demands to increase prisoners release efforts. PHOTOS+VIDEO(0)