https://theconversation.com/una-nueva-investigacion-prueba-que-la-guerra-en-europa-tiene-mas-de-5-000-anos-220177
https://www.foreignaffairs.com/articles/ukraine/2022-03-04/what-if-russia-loses
https://www.whitehouse.gov/wp-content/uploads/2021/03/NSC-1v2.pdf