PRAGUE, Czech Republic - NATO leaders agreed yesterday to issue a strong warning to Iraq as the alliance moved to transform itself from a defense-oriented relic of the Cold War to a fighting force capable of combating rogue states and terrorism worldwide.

In a historic moment that was overshadowed by the attention brought to bear on Iraq, NATO invited seven Eastern European countries - three of them former republics of the Soviet Union - to join the alliance.

Regarding Iraq, all 19 members of NATO - including war-reluctant Germany - issued a statement shortly after their summit began yesterday that was stronger than expected but weaker than the United States had sought. It alluded to force but stopped short of an explicit call for military action should Iraq thwart United Nations weapons inspectors.

"NATO allies stand united in their commitment to take effective action to assist and support the effort of the United Nations to ensure full and immediate compliance by Iraq" with a disarmament resolution passed this month by the U.N. Security Council, the leaders said in a summit communique. "We recall that the Security Council in this resolution has warned Iraq that it will face serious consequences as a result of its continued violation of its obligations."

NATO would not take part in any attack as a group - nor was it asked to - but President Bush has appealed to individual countries to join the United States should Saddam Hussein fail to disclose and destroy Iraq's weapons of mass destruction.

Bush has spent much of the summit emphasizing that Dec. 8 could be a trigger date for war if Iraq fails to disclose all its weapons capabilities by then, as called for in the U.N. resolution. That has put him at odds with a number of U.N. members and Secretary-General Kofi Annan, who have said it could take months of inspections to determine whether Iraq is honestly disclosing its weapons stock.

But yesterday Prime Minister Tony Blair of Britain sought to gloss over differences and highlight the unanimity of the statement. Blair, Bush's strongest European ally, warned that war would be the consequence if Iraq does not fully cooperate.

"I think what you'll find here at the NATO summit is a totally united determination on behalf of the international community, reflected in the U.N. resolution, that Saddam Hussein has to disarm himself," Blair said after a meeting with Bush. "I think you will find now that there is a consensus for that position virtually right across the civilized world."

Though Germany joined in the statement, it made clear that it has no intention of reversing a pledge by its chancellor, Gerhard Schroeder, to sit out any attack on Iraq.

"Our position is completely clear: We will not take part in a military strike against Iraq," German Foreign Minister Joschka Fischer told the Associated Press.

Iraq dominant issue

Iraq has overshadowed a summit that produced a remarkable formalized realliance yesterday of the post-Soviet Union globe with an invitation to Estonia, Lithuania and Latvia, former Soviet republics, and Romania, Bulgaria, Slovakia and Slovenia to join NATO. The expansion is the largest since NATO was created in 1949 as a defense-oriented alliance to fend off Soviet aggression. The countries can become members in May 2004, upon ratification by their legislatures and those of the NATO countries.

Even as it moved to add members, NATO acted to shed itself of its previous defensive mission - and criticism that it has become a toothless political club - by approving the creation of a rapid-deployment force of 21,000 troops to travel to world trouble spots and assist in the fight against terrorism.

The move to include the former communist countries was loaded with symbolism, given that it was nearly unthinkable little more than a decade ago. The latest nations invited though, will do little in the short run to enhance NATO's military capabilities. Most of their armies resemble little more than police forces.

All have small forces that are heavy with short-term conscripts and light on modern military equipment. Even the host Czech Republic, which has seen marginal gains in its military strength since its admission to NATO in 1999, was depending on American F-16 war jets to patrol its skies during the summit while using its aged Soviet-era planes to supplement the U.S. force.

Still, the invitations offer a more united Europe, which will move even further in that direction next month when eight former communist nations join the European Union. The NATO expansion also, at least in theory, ties the countries to the United States in an all-for-one military defense called for in the alliance charter.

"Anyone who would choose you for an enemy also chooses us for an enemy," Bush told the seven nations at the Prague Congress Center yesterday. "Never again in the face of aggression will you stand alone."

Bush makes appeal

On the eve of the summit, Bush had invoked the U.S. role in World War II as he issued his most forceful appeal to date for allies to join the United States in any attack on Iraq. He coupled his sales pitch with a call to NATO members to strengthen their militaries so that its member countries have the ability to sweep into countries together to quell trouble and dig at the roots of terrorism.