1. Beerli C (2016) Statement of the ICRC Vice-President at the 17th edition Bruges Colloquium. https://www.icrc.org/en/document/terrorism-counter-terrorism-and-international-humanitarian-law . Accessed 28 February 2017
2. Bellingcat (2016) Russia’s 200th Motorized Infantry Brigade in the Donbass. https://www.bellingcat.com/news/uk-and-europe/2016/01/16/russias-200th-motorized-infantry-brigade-in-the-donbass/ . Accessed 28 February 2017
3. Briggs R, Silvermann T (2014) Western foreign fighters: innovations in responding to the threat. http://www.strategicdialogue.org/wp-content/uploads/2016/02/ISDJ2784_Western_foreign_fighters_V7_WEB.pdf. Accessed 28 February 2017
4. Butusov Y (2014) The Volunteer Battalions – structure, fears, problems of use in the conflict situations, http://gazeta.zn.ua/internal/dobrovolcheskie-batalony-struktura-strahi-problemy-boevogo-primeneniya-.html . Accessed 28 February 2017
5. Centre for Research on Globalization (2016) War in Ukraine: Foreign Mercenaries Arrive in Donbass, from US, Canada, EU Countries. http://www.globalresearch.ca/war-in-ukraine-foreign-mercenaries-arrive-in-donbass-from-us-canada-eu-countries/5551803 . Accessed 28 February 2017