International Internships

International politics and policy related internships are fewer and harder to find.  They tend to be concentrated in DC or NYC.  While the links may go bad, you should be able to search for the name of the agency, think, or group. The list is more illustrative than exhaustive.

US Department of State, very nice formal internship programs, see U.S. Department of State Internship Program and Pathways Programs and U.S. Foreign Service Internship Program http://www.state.gov 
The Clinton Foundation, http://www.clintonfoundation.org/about/internships
The European Union Delegation Office in the U.S. “Vacancies and Internships” then “Internships”
http://www.eurunion.org/eu
The United Nations Office Information Center http://www.unic.org
United Nations Economic Commission Review http://www.eclac.cl/cgi-bin/getProd.asp?xml=/noticias/vacantes/default.xml&xsl=/acerca/opor-trai.xsl&base=/tpl-i/top-bottom.xsl
United Nations Economic and Social Review
Commission for Asia And the Pacific and Development Division or Trade and Investment Division
New York, New York http://www.unescap.org/jobs/internships
United Nations International Food Policy Review http://www.ifad.org/job/intern/index.htm
United Nations Secretariat Review  http://www.un.org/en/mainbodies/secretariat/
US Agency for International http://www.usaid.gov/work-usaid/careers/hiring-mechanisms/student-internships
US-China Economic and Security Commission http://www.uscc.gov
Global Fund for Women http://www.globalfundforwomen.org
Global Trade Watch/Public Citizen http://www.citizen.org  
International Economic Development Council http://www.iedonline.org/?p=Job_Center_Students
International Labour Organization http://www.ilo.org/public/english/bureau/pers/vacancy/intern.htm
Middle East Institute http://www.mei.edu/jobs-and-internships
Modernizing Foreign Assistance Network http://www.modernizeaid.net
The Atlantic Council http://www.acus.org/about/employment-internships/internship-opportunities
German Marshall Fund Internships Paid  http://www.gmfus.org/about-gmf/career-opportunities/
NDN Latin America Policy http://ndn.org
Rand Center for Latin America Policy http://www.rand.org/labor/centers/clasp.html
Washington Office on Latin America http://www.wola.org/internships_and_employment
International Republican Institute,  http://www.iri.org
National Democratic Institute for International Affairs - www.ndi.org
The State Department also has a very good list of foreign affairs related think tanks http://www.state.gov/m/fsi/tc/79982.htm
as well as international jobs overseas http://www.state.gov/m/fsi/tc/79765.htm
Russia and Former Soviet Union think tanks
US Department of State: Russian page
Library of Congress:
Russian collections at the LC
European Reading Room 
CSIS (Center for Strategic and International Studies):
Russia and Eurasia Program 
Carnegie Endowment for International Peace (Russia)
The Jamestown Foundation: Eurasia Monitor 
The Jamestown Foundation: Global Terrorism Analysis
Excellent source for Russia-related terror analysis
Small Wars Foundation: Small Wars Journal
A unique source of Russia-related terrorism analysis 
RAND Center for Russia and Eurasia
Hudson Institute: Russia program
Belfer Center for Science and International Affairs, Harvard University:
US-Russia Initiative to Prevent Nuclear Terrorism 

The Asia Society  http://asiasociety.org/
Carnegie Endowment for International Peace http://carnegieendowment.org
American Foreign Policy Council (AFPC)
American Institute for Contemporary German Studies (AICGS) 
 Asia/Pacific Research Center, Stanford University (A/PARC) 
 Institute for Policy Studies (IPS) 
 International Food Policy Research Institute (IFPRI) /
The 1990 Institute China
 Overseas Development Council (ODC) 
 World Policy Institute (WPI)
The Washington Center list  http://washingtoncenter.ucr.edu/ThinkTanks.pdf