https://www.kyivpost.com/article/opinion/op-ed/steven-pifer-ukraine-and-nato-dont-ask-do.html
https://www.city-journal.org/europe-is-losing-the-energy-war?utm_source=Weekly%20Newsletters&wallit_nosession=1
https://www.brookings.edu/blog/order-from-chaos/2018/04/16/a-trump-doctrine-for-the-middle-east/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=62141177
https://www.brookings.edu/research/a-post-american-europe-and-the-future-of-u-s-strategy/