When you look at the top five weapons exporter in the world [1], then at the United Nation Security Council permanent members [2], you'll understand there is no easy solution to that problem as it is, politically at least.

[1] https://en.wikipedia.org/wiki/Arms_industry#World.27s_larges...

[2] http://www.un.org/en/sc/members/

tl;dr those who protect peace also nurture war.