They should abduct some of these English speaking mercenaries and then parade them before the media. That will show the world who is actually fermenting the trouble in Ukraine.
Easier said than done. From mobile video recordings and live feeds that 247crypto linked to, you can see that those forces are either transported in tightly-sealed buses, surrounded by Ukrainian military, or shunted right to the back upon unloading, with Ukrainian military forming a buffer between them and the protesters. They are treated like family jewels, or prised hounds, to be unleashed at a later point. In the meantime they are kept as damage-free as possible.
I think the only way they'll be paraded before the media, is in plastic bags (if the stand-off comes to that). So far they've only been confronted with people armed with videocameras.
A racist warning below:
When one of the protesters spotted a black-skinned soldier in a bus, he cried "can I pet the monkey". Ukraine in general and their armed forces in particular are rather homogeneous white, so any black soldier immediately stands out.