Arming Ukraine could put the United States in an awkward position vis-à-vis its NATO allies.
http://nationalinterest.org/feature/why-lethal-aid-cant-help-ukraine-22114
http://hvylya.net/analytics/politics/zachem-fsb-otkryilo-konservu-s-pohishheniem-pavla-griba.html
https://day.kyiv.ua/ru/article/den-planety/tramp-rossiya-i-ugrozy-bezopasnosti
http://www.dsnews.ua/world/igry-v-pryatki-s-otkrytymi-glazami-chto-putin-skryvaet-ot-30082017151200
http://www.rosbalt.ru/world/2017/08/30/1642319.html
http://www.kasparov.ru/material.php?id=59A6D8DCBD13A