By Louis Charbonneau

UNITED NATIONS, Sept 24 (Reuters) - U.N. Secretary-General Ban Ki-moon said on Wednesday he was worried about the fate of a global pact banning nuclear tests and urged the United States, Iran, China and other hold-outs to sign and ratify it.

The Comprehensive Nuclear-Test-Ban Treaty (CTBT) opened for signatures 12 years ago. Since then, 179 nations have signed and 144 ratified it. Missing are nine states with nuclear activities, whose ratification is required.

"The (CTBT) has achieved near universal adherence," Ban told a meeting of 40 foreign ministers on the sidelines of the U.N. General Assembly. The ministers agreed a joint statement appealing to hold-out countries to ratify the pact.

"Despite the progress that has been made, the CTBT has still not entered into force," Ban said. "This is cause for serious concern."

Echoing the ministers, he urged "all governments that have not yet done so to sign and ratify the treaty without delay."

The United States signed the treaty in 1996 during the administration of President Bill Clinton, a Democrat, but the then-Republican-majority U.S. Senate rejected it 1999.

When President George W. Bush took office in 2001 his administration made clear it did not want its options limited by such a treaty and never resubmitted it.

William Perry, the U.S. defense secretary at the time Washington signed the treaty, said he thought the next president, whether Republican Sen. John McCain or Democratic Sen. Barack Obama, will send it back to the Senate for ratification.

"I believe that has a good probability of changing with the new president of the United States," Perry told reporters.

Washington is joined by China, North Korea, Egypt, India, Indonesia, Iran, Israel and Pakistan as hold-out countries whose ratification is necessary for the treaty to enter into force.

Some analysts have said that if the United States fails to ratifies the treaty, it will most likely die.

PRESSURE ON U.S., NORTH KOREA, INDIA

China, Israel, Pakistan and India are also considered nuclear weapon states. Western countries believe Iran has a secret atom bomb program but Tehran denies this.

North Korea, which conducted a nuclear test in 2006 and agreed last year to scrap its atomic weapons program in an aid-for-disarmament deal, has expelled U.N. monitors from a plutonium-producing that it plans to reactivate next week.

Australian Foreign Minister Stephen Smith said North Korea's recent moves were alarming and expressed the hope that the U.N. Security Council would consider "further diplomatic measures" to pressure Pyongyang to change course.

German Foreign Minister Frank-Walter Steinmeier urged India, which hopes to develop normal nuclear trade relations with the world's top producers and suppliers of atomic technology, to sign the pact. Like Israel and Pakistan, India has not signed the nuclear Non-Proliferation Treaty aimed at stopping the spread of atomic weapons. (Editing by Alan Elsner)

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