Satan has no power over who rules over nations.
Read Daniel chapter 4 a few times until it sinks in.
There is a big difference in GOD being able to do anything and what HE chooses to do. I am not really qualified to speak to any part of GOD’s plan... beyond what I read in the Bible. I do believe that GOD has a plan and that everything that we see, feel and experience is part of that plan. Within that plan resides free will. HE calls us to HIM, HE does not order us to HIM.
GOD created Adam and then Eve. He gave them free will and they disobeyed HIS law and chose the forbidden fruit and that set man’s path on what has been prophesied. GOD could stop all evil... HE will one day without doubt... HIS word says so. HE wishes for every soul to come to HIM in repentance through HIS SON CHRIST. HE could simply make every soul to come to HIM... but if HE did this... how could HE have a meaningful relationship as HIS creation? We have a gift of free will... we are free to choose and that evidence is indisputable. We are not allowed the pleasure of our own consequences for those choices. I see nothing in conflict here.