MANILA, SEPT. 1 -- Gen. Fidel V. Ramos, the armed forces chief of staff, said the apparent decision by leaders of a failed military coup to set up a provisional government under a ruling junta was "a last-ditch effort to generate support for a lost cause."

Ramos said the announcement of the junta -- coming in the form of an unverified, one-page statement delivered to news agencies and circulated on military bases -- showed that the real objective of Friday's bloody uprising was to seize government power.

"We will do everything to make sure it does not disturb {or} endanger the sovereignty, integrity and security of . . . the Philippines," Ramos told a news conference.

Other government officials and congressional leaders today attempted to play down the significance of the rebel statement. "If a junta does not control one square meter of territory, then it is a phantom junta," said Teodoro Benigno, press spokesman for President Corazon Aquino.

"It has no legal basis, no moral foundation, no territory, no people -- none of the necessary elements to constitute a valid provisional government," said Sen. Teofisto Guingona.

The statement, signed only by "The Ruling Junta," said the Aquino government has allowed corruption to flourish and peace and order to deteriorate and "has acknowledged the fact that Communists are occupying high positions of responsibility." The statement, dated Saturday, also criticized the government for failing "to listen and effectively respond" to the grievances of the military.

Political analysts were still divided today over whether the statement was actually issued by the leaders of Friday's violent and bloody coup attempt who are still at large with an unknown number of rebel soldiers somewhere on Luzon island. One officer closely allied with the rebel leaders, however, said the document was probably authentic and that the rebels may now be preparing to form a private right-wing army to wage war on the Communists and the Aquino government.

This officer said one component of this new phase of the revolt might be to launch a campaign of urban warfare. The coup leader, Col. Gregorio (Gringo) Honasan, had been assigned to training Army recruits in counterinsurgency and unconventional warfare before he decided to break with the government and stage his rebellion.

The purpose of announcing a "provisional government," this well-connected officer said, is to pressure the Aquino government to negotiate, the same way that it has negotiated cease-fires with Communist rebels, Moslem insurgents and a breakaway minority group led by a rebel Catholic priest fighting for autonomy for the Cordillera mountain region.

Aquino has called for the arrest of the coup leaders, and during their revolt she announced that there would be "no terms." But today, in what seemed a reversal, a presidential spokesman seemed to take a more conciliatory line and suggested that the government might be willing to talk to the renegade troops.

"If there is a reasonable request, there is no reason why the government will not talk," said Danilo Gozo, a palace spokesman. "But first, let's get an official request."