The Pentagon's plan to shoot down a failed satellite with a missile defense interceptor in the coming days is aimed at preventing toxic fuel from reaching earth. But U.S. officials and experts said yesterday it would also signal that U.S. missile defenses can be used to counter China's strategic anti-satellite weapons.

China conducted its first successful test of an anti-satellite (ASAT) weapon on Jan. 11, 2007, in what defense and military officials called a new strategic threat to the United States.

Bush administration defense and national security officials involved in interagency discussions on the satellite destruction plan said one reason for using the missile defense system against a space target would be to highlight its potential as an ASAT weapon. The Pentagon has been discussing ways to deter and counter China's ASAT weapon, which can threaten U.S. military and civilian communications, especially command and control systems involving satellites.

Publicly, however, officials who announced the plan yesterday sought to play down the ASAT capability.

The Greyhound bus-sized intelligence satellite failed shortly after launch in 2006. Intended to conduct both electronic eavesdropping and photographic intelligence-gathering, the satellite contains a large tank of unused toxic fuel called hydrazine. The fuel would pose a health risk if the tank survived re-entry and landed in a populated area. The satellite has been gradually moving closer to the atmosphere and could come down some time in the next several weeks.

Since the satellite cannot be maneuvered to fall into the ocean, the plan calls for firing a modified Navy SM-3 anti-missile interceptor from an Aegis battle management system equipped warship in the northern Pacific, as the satellite nears the atmosphere.

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