Iraqi Ambassador Mohamed Mashat yesterday released a purportedly secret memorandum seized from Kuwaiti intelligence files that he said showed Kuwait had been conspiring with the CIA to destabilize Iraq.

The 1989 memo, on its face, was more innocuous, referring only to an alleged agreement to "put pressure" on Iraq to delineate its border with Kuwait, but the CIA said even that was false.

All statements in the document that refer to Kuwait's relations with Iraq or any other countries "are total fabrications and without foundation," CIA spokesman Mark Mansfield said.

Mashat said at a news conference yesterday that he expected the agency denial. But he asserted there was more to come, presumably from the captured Kuwaiti files.

The document released here purports to be a "Top Secret and Private" memo from the director general of Kuwait's State Security Department to the Kuwaiti interior minister, recounting a meeting the security chief said he had with CIA Director William H. Webster on Nov. 22, 1989.

According to the document, the security chief, Brig. Fahd Ahmad Fahd, said the United States would provide security training at the CIA for 128 handpicked Kuwaitis who would be taught how to protect Kuwait's ruling emir and the prime minister. Some of them, the memo added, would be used "for special missions with the royal family."

The Fahd memo went on to say he and Webster agreed on other details, including exchanges of information. Typed in Arabic but accompanied by an unofficial translation in English, the memo added:

"We agreed with the American side that it was important to take advantage of the deteriorating economic structure in Iraq in order to put pressure on that country's government to delineate our common border. The Central Intelligence Agency gave us its view of appropriate means of pressure, saying that broad cooperation should be initiated between us, on condition that such activities are coordinated at a high level."

Mashat maintained the memo "substantiates" Iraq's claims that "all along there existed an economic conspiracy aimed at destroying our economy and destabilizing Iraq." He said the memo came from Kuwaiti intelligence files abandoned when members of the royal family fled from invading Iraqi forces Aug. 2. He also noted that it ended with what purported to be the tele- phone number of "Mr. Webster's private line" in Washington.

"Someone called Friday and verified that it {the number} was still there," Mashat said. "Maybe since Friday, now it's been changed."

A woman who answered at that number yesterday, asked if it was Webster's, said "no, it's not," and hung up quickly, apparently not for the first time.

The CIA's Mansfield said that, contrary to the assertions in the memo, neither Fahd nor a Kuwaiti colonel purportedly with him met with Webster. Mansfield said Kuwait's deputy director general of state security, Sheik Salman Sabah, made "a routine courtesy call" on Webster in November 1989, but, Mansfield said, "there was nothing discussed at that meeting concerning Kuwait's relations with Iraq or other countries."

Mansfield did not discuss the reference to security training, a routine staple of CIA support for friendly nations, and offered no other details. Another source said the Iraqis may well have seized some records, but that it is impossible to tell whether the memo represented Kuwaiti exaggeration, Iraqi tinkering with a real document, or Iraqi fabrication of a new document with some details from a "perfectly innocuous one."

Mashat insisted "there is more to this story than the snapshot this document offers." Baghdad has been publicizing it since last week when Iraqi state radio summarized it as showing "the horrible details" about Kuwait's CIA connections.