The Brussels mini-summit is supposed to affirm the relevance of the alliance in the Trump era but there is a risk that it could severely undermine it. President Trump is the only American president since NATO’s founding who has not explicitly endorsed Article 5.
https://www.brookings.edu/blog/order-from-chaos/2017/05/17/trumps-nato-article-5-problem/
http://www.rbc.ru/newspaper/2017/05/17/591abb079a794746c3c69b03
https://www.kommersant.ru/doc/3298506
https://www.gazeta.ru/army/2017/05/17/10678145.shtml
https://www.kommersant.ru/doc/3296934
https://republic.ru/posts/82970
The Alliance’s success in adapting its deterrence posture has brought into focus a range of more complex challenges.
http://www.iiss.org/en/regions/russia/59-3-09-ringsmose-and-rynning-356e
http://day.kyiv.ua/ru/article/mirovye-diskussii/kak-prevratit-ordlo-v-gosudarstvo-v-gosudarstve