Congressional Research Service. April 3, 2013. 

This report summarizes what is known from open sources about the North Korean nuclear weapons program—including weapons-usable fissile material and warhead estimates—and assesses current developments in achieving denuclearization. 

http://fpc.state.gov/documents/organization/207428.pdf [PDF format, 35 pages].

The Heritage Foundation. November 5, 2012.

When the Libyan regime of Colonel Muammar Qadhafi fell last year, its weapon stockpiles were looted and dispersed throughout Libya and beyond. Of the thousands of arms the regime stored, approximately 10,000 man-portable air defense systems (MANPADS) are still unaccounted for. MANPADS have the capacity to down commercial jetliners, are easily concealed, and, if obtained by actors hostile to U.S. interests, pose an international security threat that U.S. leadership could not ignore. [Note: contains copyrighted material].

http://www.heritage.org/research/reports/2012/11/manpads-countering-weapons-proliferation-in-north-africa-and-the-sahel [HTML format].

U.S. Department of State. July 12, 2012.

Today, the United States is imposing additional sanctions on Iran’s nuclear and ballistic missile proliferation networks, and is also taking additional steps to prevent the evasion of sanctions by publicly identifying a group of Iranian front companies and banks. These actions are part of the United States government’s dual-track approach of increasing pressure to convince Iran to engage seriously and address the international community’s concerns about its nuclear program.

http://www.state.gov/r/pa/prs/ps/2012/07/194923.htm [HTML format].

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Unclassified Statement for the Record on the Worldwide Threat Assessment of the U.S. Intelligence Community for the Senate Select Committee on Intelligence. Statement by Honorable James R. Clapper, Director of National Intelligence. January 31, 2012.

This statement provides extensive detail about numerous state and nonstate actors, crosscutting political, economic, and military developments and transnational trends, all of which constitute our nation’s strategic and tactical landscape. Although I believe that counterterrorism, counterproliferation, cybersecurity, and counterintelligence are at the immediate forefront of our security concerns, it is virtually impossible to rank—in terms of long-term importance—the numerous, potential threats to US national security. The United States no longer faces—as in the Cold War—one dominant threat. Rather, it is the multiplicity and interconnectedness of potential threats—and the actors behind them—that constitute our biggest challenge. Indeed, even the four categories noted above are also inextricably linked, reflecting a quickly changing international environment of rising new powers, rapid diffusion of power to nonstate actors and ever greater access by individuals and small groups to lethal technologies.

http://www.dni.gov/testimonies/20120131_testimony_ata.pdf [PDF format, 31 pages].

Atlantic Council. January 17, 2012.

The Atlantic Council’s Iran Task Force held a public briefing on January 17 on the rising conflict between the United States, Israel, and Iran. Tensions are mounting as the United States and Europe tighten economic sanctions against Iran, and Iran responds with a ten-day naval exercise in the Persian Gulf, and threatens to close the strategic Strait of Hormuz. Meanwhile, the United States and Israel are preparing for their own joint military exercise. Are the chances for a military confrontation between Israel and Iran and between the United States and Iran increasing? Would Israel consult the United States before attacking the Iranian nuclear program? What would be the consequences for the region and world economy? The Iran Task Force seeks to perform a comprehensive analysis of Iran’s internal political landscape, its role in the region and globally, and any basis for an improved relationship with the West. [Note: contains copyrighted material].

http://www.acus.org/event/us-israel-and-iran-looming-military-confrontation [HTML format].