https://thehill.com/opinion/4244449-a-new-american-strategy-for-ukraine/
https://sgp.fas.org/crs/natsec/RL33110.pdf
http://www.irsd.be/website/images/livres/rmb/19/ed_19_art_16.pdf
https://www.einnews.com/pr_news/589110316/from-strategic-reassurance-to-running-over-roadblocks-a-review-of-xi-jinping-s-foreign-policy-record