Show me.
I was curious too...did a search of 'ukraine mercenaries'.
Seems all of the stories are either Russian sources or western media repeating Russian claims of US mercenaries working for Greystone in Ukrainian uniforms trying to incite a civil war - they have been pushing this since April. Hardly pro-Kiev though.
It does explain where their absurd claim that the CIA shot down the jet came from. I must say in soviet accent...is boolsheet.