Jethro wanted chaos to erupt in Ukraine to hasten the current government's fall, but he certainly didn't wish for an internal war in Ukraine.
It was only with Arseniy's people in power that Jethro had a chance to wrestle the large Ukrainian arms stockpile from Big Ivan, but if internal war broke out, the outcome of who would lose and who would win was uncertain.
That was why Jethro was so furious, Arseniy's crew clearly had the opportunity for a peaceful resolution, but who knows whose terrible idea it was to order the Golden Eagle Troops to kneel and apologize, which was a vicious stab at the already tense emotions of the Eastern Ukrainians.
The Golden Eagle Troops were numerically few, and their role in the entire Ukrainian chaos was limited, but forcing the Golden Eagle Troops to kneel was an event with a significant symbolic impact, pushing the situation towards a battle.
Jethro threw a hysterical fit but ultimately, he could only helplessly accept reality.
