There's no shortage of mercs in the world. A friend dated one for a while. They would travel the world, and he would disappear for a week or two 'for work' and leave her on a beach with a book. She only found out when they stopped dating. (No comment on her powers of observation...)
The key is how they are showing up. Mercs will show up in ones and twos; if they are being fielded by a security company, maybe dozens at a time. Sixteen thousand showing up in a week or two would definitely be suspicious. That's more than a fucking division.
Canada couldn't field a division right now, by point of comparison. It would take a year or more build-up.
So, either something strange is going on, or he's entirely full of shit. Propaganda is a thing, too.
How about fucking ISIS
Well, that's a very interesting point... My mind went to state actors. Lots of non-state actors who might want to get in on the action.
Chechen don't like ISIS much as I understand it
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