Those solutions were given to humanity back in the mid 1800's. I again share advice from Baha'u'llah.
"....The time must come when the imperative necessity for the holding of a vast, an all-embracing assemblage of men will be universally realized. The rulers and kings of the earth must needs attend it, and, participating in its deliberations, must consider such ways and means as will lay the foundations of the world’s Great Peace amongst men. Such a peace demandeth that the Great Powers should resolve, for the sake of the tranquillity of the peoples of the earth, to be fully reconciled among themselves. Should any king take up arms against another, all should unitedly arise and prevent him. If this be done, the nations of the world will no longer require any armaments, except for the purpose of preserving the security of their realms and of maintaining internal order within their territories. This will ensure the peace and composure of every people, government and nation..."
Abdul'baha expanded on this in the early 1900's and before the first World war gave this advice whilst in America about what a Union of Nations should put on the table to discuss. Note what is offered about National Boundaries.
“They must make the Cause of Peace the object of general consultation, and seek by every means in their power to establish a Union of the nations of the world. They must conclude a binding treaty and establish a covenant, the provisions of which shall be sound, inviolable and definite. They must proclaim it to all the world and obtain for it the sanction of all the human race. This supreme and noble undertaking—the real source of the peace and well-being of all the world—should be regarded as sacred by all that dwell on earth. All the forces of humanity must be mobilized to ensure the stability and permanence of this Most Great Covenant. In this all-embracing Pact the limits and frontiers of each and every nation should be clearly fixed, the principles underlying the relations of governments towards one another definitely laid down, and all international agreements and obligations ascertained. In like manner, the size of the armaments of every government should be strictly limited, for if the preparations for war and the military forces of any nation should be allowed to increase, they will arouse the suspicion of others. The fundamental principle underlying this solemn Pact should be so fixed that if any government later violate any one of its provisions, all the governments on earth should arise to reduce it to utter submission, nay the human race as a whole should resolve, with every power at its disposal, to destroy that government. Should this greatest of all remedies be applied to the sick body of the world, it will assuredly recover from its ills and will remain eternally safe and secure.”
For the Lesser Peace to unfold, this advice must be implemented, that is more than my individual opinion.
Regards Tony