Russia pulls out of two-decade deal to co-operate with U.S. on safeguarding its nuclear stockpile

http://news.nationalpost.com/2015/01/23/russia-pulls-out-of-two-decade-deal-to-co-operate-with-u-s-on-safeguarding-its-nuclear-stockpile/

Relations with Russia chill, and nuclear security cooperation gets put on ice

http://www.pri.org/stories/2015-01-22/relations-russia-chill-and-nuclear-security-cooperation-gets-put-ice

NNSA claims Russia, USA to continue nuclear security cooperation
http://www.turkishweekly.net/news/179052/nnsa-claims-russia-usa-to-continue-nuclear-security-cooperation.html

Russia Denies Ending Nuclear Cooperation With US, Joint Effort To Continue In 2015

http://www.ibtimes.com/russia-denies-ending-nuclear-cooperation-us-joint-effort-continue-2015-1792404

NNSA Claims Russia, USA to Continue Nuclear Security Cooperation

http://sputniknews.com/us/20150123/1017254553.html