TOKYO — Prince Norodom Sihanouk, Cambodian prime minister, Monday pledged his country to stand solidly against any foreign aggression.

The 33-year-old chief of state is in Japan to negotiate a friendship treaty between the two countries and to seek technical assistance in developing Cambodia's agriculture and cottage industries.

The prime minister, who abdicated as king and then was elected by the people to the premiership in an open election, said that his country has 40,000 men under arms and would increase this to 50,000.

He insisted that Cambodia would join no alliances and would not permit foreign countries to station troops on Cambodian soil. He said that the U.S. supports the Cambodian forces with materiel and France supplies military instructors, due to language barriers.

Norodom denied reports of communist infiltration of his country, located between Indochina and Thailand. He said that a group of about 100 rebels hiding in the jungles is being supplied with arms by some "unknown" foreign element.

The prince will return to Cambodia Saturday.

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