Courtesy Reuters

The Best Defense?

Preventive Force and International Security

After 9/11, U.S. President George W. Bush announced his determination to do whatever was necessary to prevent future terrorist attacks against the United States. Following the lead of several countries that had recently come to similar conclusions after their own bitter experiences -- including India, Israel, Japan, Russia, Spain, and the United Kingdom -- the United States tightened its immigration laws; increased the protection of its borders, ports, and infrastructure; criminalized providing "material support" for terrorist groups; and tore down the wall between the intelligence agencies and law enforcement agencies, which had crippled counterterrorist efforts for decades. Washington did not authorize preventive detention, as other countries had, but it used other measures to hold persons against whom criminal charges could not be brought -- thereby preventing terrorist attacks. The U.S. government also led or joined various international efforts aimed at warding off new dangers, such as the Proliferation Security Initiative, through which over 70 states cooperate to interdict the movement of nuclear materials across international borders.

But the Bush administration's call for preventive action went further: it endorsed using force against states that supported terrorism or failed to prevent it. This was a particularly controversial position, since using (or threatening to use) preventive force across international borders is generally considered to be a violation of international law: the International Court of Justice (ICJ) and most international legal authorities currently construe the United Nations Charter as prohibiting any use of force not sanctioned by the UN Security Council, with the exception of actions taken in self-defense against an actual or imminent state-sponsored "armed attack."

Now that the Bush administration is no longer in power, some argue that its approach to this subject should be shelved. But the objective of preventing terrorist threats before they are realized -- rather than primarily treating terrorism as a crime warranting punishment after the fact -- is now established as an essential element of U.S. national security. Indeed, in 2008, Barack Obama, then a presidential candidate, told

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