The protesters started to gather near the Eternal Flame at 10 hours in the morning, after which they marched to Lenin Square along the Leninsky avenue.
Miners from Donetsk, Gorlovka, Yenakiyevo, Snezhnoye and Torez coalmines are taking part in the action. The demonstrators changed “No War!”
A live video broadcast shows the Lenin Square crowded with people. Most people are not holding any flags or posters.
A Kiev-led punitive operation against federalization supporters in Ukraine's east that involves armored vehicles, heavy artillery and attack aviation has already claimed hundreds of lives, including civilian, and left some buildings destroyed and damaged.
The Donetsk and Luhansk regions, which border on Russia, held referendums on May 11, in which most voters supported independence from Ukraine. Their independence has not been officially recognized.