Before you have power over others you have to be qualified, otherwise, like less upright kid guiding more upright adults, you'll lead those above you into problems. Besides, the leaders or presidents you see today were made leaders(or allowed to be leaders) by our CREATOR. They were given the power, which in most cases are approved by the people they lead because they seem better or more capable than they are.

The issue with Russia/Ukraine or Israel/Palestine is a problem of people rebelling or refusing to obey higher power or the
more righteous ones (which usually translate to more power) with better understanding and judgements. In this case the high power will try to exercise his authority by force which becomes a prove to the rebels that he's actually higher in power and supposed to be obeyed or taken seriously.