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The price of Brent crude drops to $55.54 per barrel.
The head of the President's Administration reckons "there should be no people doing nothing."
About 40 people took part in the action of solidarity with Putin critic Alexei Navalnyi and his brother.
People went to Manezhnaya Square on Tuesday evening.
The USA took the oil prices into account when imposing sanctions on Russia, the American President said.
The device was working round the clock and could record video and audio.
The contact group will gather in the Belarusian capital to discuss the situation in Donets Basin again.
Over 17 thousand people have taken part in the demonstration.
Tripartite contact group will meet in the Belarusian capital on 24 and 26 December.
