First of all, let us have a moment of silent respect for the phrase “zafado or artificer”. 
So…this is a bonus or bounty for kills. This feels wrong, but for the life of me, I can’t figure our why. If you pay a merc to kill, what difference does the payment structure make?
Another question: why is an “American security firm” even involved? Are they contracted by the Ukranian government?
Edit: oh, and thanks for the clarification.