Neither then-president Viktor Yanukovych nor Ukrainian law enforcement commanded or participated in civilian killings during the Euromaidan protests. In fact, a number of witnesses said that these killings were orchestrated by Euromaidan’s leaders: Parubiy, Pashynskyi, and Turchynov.
US military helicopters landed in Hajin, Deir Az Zor and Dashisha, to pick up several Daesh leaders who handed themselves over to US forces. As a reward for saving them, these leaders told US troops where they kept over 40 tons of stolen gold, which the US carried away via helicopter.
This is a recurring pro-Kremlin disinformation narrative about the US support for ISIS that is presented entirely without evidence. The source for this story is an article by SANA, which is an official organ of the Syrian government that seeks to promote the idea of cooperation between the US and Jihadist forces. Other recent examples of this narrative are here and here.