By Julian E. Barnes 

WASHINGTON--The U.S. military said on Wednesday that it conducted a successful test of a portion of the missile-defense system intended to become the cornerstone of the U.S. missile shield in Europe.

The test was conducted on a land-based Aegis weapon system in Hawaii, similar to the equipment the U.S. plans to deploy next year in Romania.

The U.S. currently uses Aegis radar aboard Navy ships to track missile launches. As part of its effort to expand Europe's missile defenses, the U.S. is planning to deploy a so-called "Aegis Ashore" system in Romania.

"What we have done is tested a system similar to what we are shipping to Romania," said Col. Steve Warren, a Pentagon spokesman.

Vice President Joe Biden visited Romania this week as part of a U.S. campaign to reassure allies in East Europe in the face of Russia's intervention in Ukraine.

The test of the missile-defense system, which occurred Tuesday evening in Hawaii, didn't involve the attempted intercept of a real ballistic missile. Instead, officials were testing the Aegis system's ability to detect and launch the SM-3 interceptors. Raytheon Co., which makes the SM-3 missile, said a more-advanced intercept test is scheduled for the system next year.

Eastern European members of the North Atlantic Treaty Organization have been fiercely supportive of the missile-defense system, seeing it as symbolic investment in their defenses by the U.S.

But Russian officials have fiercely criticized the ballistic-missile-defense system despite repeated denials by the Pentagon that the U.S.'s missile defenses are aimed at Moscow or would be even be capable of stopping advanced Russian missiles. Russian officials have threatened in the past to increase deployments of advanced weapons if the U.S. continues to deploy the missile shield.

Riki Ellison, the chairman of the Missile Defense Advocacy Alliance, hailed the test and said the system holds the promise of being used in the U.S., Japan and elsewhere to defend against missile threats.

Write to Julian E. Barnes at julian.barnes@wsj.com

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