ships at sea to inspection in ports. The vast majority of PSI exercises (see exercises section above) include activities involving customs services, law enforcement officials, and focus on cargo traveling by air and land as well as sea - including cargo transiting within a country's territory. This directly contradicts the common perceptions of PSI as military, maritime or high seas-focused. As noted within the PSI principles, PSI is an "activity, not an organization" and grants no state any additional authorities to take action. All states are merely asked to take actions consistent with domestic and international law. Therefore, PSI as an initiative explicitly recommends only actions within international and domestic legal authorities. A large portion of states which have been critical of PSI consider themselves part of the Non-Aligned Movement, which indicates that while nominally claiming objections to the initiative for "legal" reasons, actual hesitation towards endorsement might be more aligned with political considerations, such as not wanting to be seen as supporting United States or "Western" initiatives. China's objections for supposed legal reasons also come into question, as it has been identified as a neighboring country which has supported transshipment of DPRK's WMD materials, and "turns a blind eye to North Korea’s proliferation whenever it can get away with it." See also Timeline resources and general review of PSI at Biosecurity Commons, a Wiki database PSI Website (Hosted by Germany) Container Security Initiative Global Initiative to Combat Nuclear Terrorism Nuclear proliferation Chemical, biological, radiological, and nuclear Global Trade Exchange References External links PSI website (hosted by Germany) Official United States Department of State PSI Homepage New U.S. policy to block freedom of the seas, The Guardian, September 17, 2003. Dan Smith. The Proliferation Security Initiative: A Challenge Too Narrow, Foreign Policy In Focus, October 2003. Proliferation Security Initiative at SourceWatch Arms control Law of the sea International security Military alliances 21st-century military alliances Military of the United Kingdom Military of Australia Military of the United States International military organizations Organizations established in 2003 History of the Royal Navy 21st-century military history of the United Kingdom 21st-century military history of the United States Presidency of George W. Bush