Ships from the United States and five other countries will interdict a British vessel in the Persian Gulf on Monday in a mock interception of dangerous weapons technology, an exercise the U.S. expects nearby Iran to notice.

For the first time, an Arab nation, Bahrain, will participate in an exercise under the three-year-old proliferation security initiative. That U.S. program is aimed at getting countries to cooperate in halting shipments of materials that can be used for advanced weapons.

France, Italy, Britain and Australia also will participate in Monday's exercise, the 25th held under the initiative and the first held in the Persian Gulf.

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The practice interception comes as the United States is seeking support for UN sanctions against Iran for its nuclear program. On Friday, Iran stepped up its uranium enrichment program, according to a semiofficial news agency.

"From Iranian news reports we know the exercise got the attention of Iran," Robert Joseph, undersecretary of state for arms control and international security, said Friday.

The exercise also comes as the United States is urging northeast Asian countries for strict enforcement of UN sanctions against North Korea, which detonated a nuclear explosion October 9. Those sanctions ban Pyongyang's weapons trade and suggest that North Korean ships be searched for suspected illegal materials.

The Bush administration and the several dozen countries who support the proliferation initiative say stopping ships in international waters on suspicion they are carrying illicit traffic is legal, but there is some uncertainty about whether the suspect cargo can be seized.

In any event, conducting an exercise within range of Iran could be taken by Tehran as a demonstration of international resolve to curb its nuclear programs.

Bahrain will provide a frigate for the exercise, while Kuwait, Qatar and the United Arab Emirates, three other Arab countries, also will offer a measure of support as observers. Other observers include Russia, Japan and South Korea. Saudi Arabia, the largest of the Gulf countries, has not joined them.