Gori, Georgia ? Russian troops, in violation of a cease-fire agreement reached on Tuesday, embarked Wednesday on what Georgian officials called a deliberate and systematic attempt to demolish what remains of the Georgian military.

The actions ignited an angry response from the United States, with President Bush demanding that Moscow withdraw its forces from Georgia.

The president also announced that U.S. military aircraft and ships would begin delivering humanitarian aid to the former Soviet republic in a “vigorous and ongoing” operation and that U.S. officials would expect unfettered access to Georgia’s ports and highways.

“The United States stands with the democratically elected government of Georgia and insists that the sovereignty and territorial integrity of Georgia be respected,” Bush said in a brief White House appearance with Secretary of State Condoleezza Rice and Defense Secretary Robert Gates by his side.

The decision to dispatch aid aboard military aircraft potentially put the United States and Russia on a collision course, but Pentagon officials said they were taking pains to ensure that the Russians were fully informed of all U.S. actions to avoid misunderstandings.

U.S. officials said a 12-member assessment team arrived in Georgia late Wednesday, along with a C-17 military transport plane loaded with 30 tons of relief supplies, and that a second aircraft would be dispatched today.

In Washington, Rice summoned Cold War imagery to denounce Russian actions.

“This is not 1968,” she said, a reference to the Soviet Union’s invasion of Czechoslovakia to crush the “Prague Spring” pro-democracy movement.

Rice was to travel to Paris to confer with French President Nicolas Sarkozy, who brokered the cease-fire agreement, and then to Tbilisi to demonstrate American solidarity with Georgia.

The U.S. actions came on a day when Russian troops demonstrated that they could go anywhere they wanted in Georgia, and that no one could stop them.

Moving well beyond the supposed truce lines in the breakaway province of South Ossetia, Russian forces occupied the town of Gori, where the Georgians have a military installation. They then moved along the highway toward Tbilisi, the Georgian capital, and occupied a second Georgian military base, according to Georgian national security council spokesman Zurab Katchkatchishvili.

In Georgia’s west, Katchkatchishvili said, Russian forces burned three Georgian coast guard vessels in the Black Sea port of Poti.

“Clearly their intention is to destroy all military bases and equipment before pulling out,” Katchkatchishvili said in a phone interview.

Those movements violated an agreement brokered by France that called on Russia and Georgia to return their troops to the positions they held on Aug. 6, before a Georgian attempt to capture the capital of South Ossetia brought hundreds of Russian tanks and thousands of Russian troops into Georgia.

Anatoly Nogovitsyn, the deputy head of the Russian General Staff, told a news conference in Moscow that Russia hadn’t overstepped the agreement. “I can tell you with all responsibility that there are not and cannot be any tanks in Gori,” he said.

A McClatchy Newspapers reporter, however, saw two Russian tanks positioned on the main route out of Gori on Wednesday afternoon. The Russian soldiers wouldn’t allow the reporter to leave on the road leading back to Tbilisi.

Cars that tried to pass from Gori in the other direction, toward South Ossetia, were shot at by Russian troops – whether they were just warning shots was hard to tell – positioned near a Georgian military base that also had been overrun.

In the cease-fire agreement, Russian officials had reserved wide-ranging authority to pursue threats on the battlefield, such as military units attacking theirs or advancing in a hostile manner.

The only Georgians visible in Gori were civilians, however, many of them elderly.

On Wednesday afternoon, Gori seemed far removed from a cease-fire. With bursts of AK-47 fire ringing out, residents stumbled around the streets, dazed and often carrying loaves of bread, trying to figure out what to do.

The Georgian military had completely abandoned the town. A small group of Orthodox priests were walking from one block to the next, blessing the ground with holy water in hopes of peace.

Givi Ramazashvili said that the last time he saw Georgian soldiers, “they were scared to death.”

On a small country road several miles outside Gori – used because Russians had shut down the main road – eight Georgian soldiers were standing under a group of fruit trees. One of them, a colonel, said he’d seen two columns of Russian tanks, one of them near Gori and the other moving toward Tbilisi.

The colonel, who didn’t give his name, and his men had only assault rifles. They looked anxious at the prospect of coming into contact with the tanks.

Russian violations of the agreement also took place in nearby villages, where tall plumes of smoke were visible.

Witnesses said that Russian troops had entered the villages, and then allowed South Ossetian militia members to plunder houses and steal cars.

“Our village is burning. They are taking everything out of our houses,” said Dodo Gagnidze, who was standing on the side of the road near Gori. “The Russians said everything was over. Is this what they mean?”

Human Rights Watch issued a statement Wednesday saying that its researchers had seen South Ossetian militias burn and loot Georgian villages on Tuesday. The organization quoted a village official in the Gori area saying that at least three villages had been burned.

In recent days, Russian officials have blasted the United States, which backed Georgia’s push for membership in the North Atlantic Treaty Organization. The Kremlin has also singled out Ukraine, another former Soviet republic with a NATO application pending.

On Tuesday, the leaders of four former Soviet republics – Lithuania, Latvia, Estonia and Ukraine – as well as the president of Poland, a former Soviet satellite, joined Georgian President Mikhail Saakashvili at a late-night rally, where they vowed never to surrender their independence to Russia.

Both U.S. presidential candidates welcomed Bush’s actions and offered further initiatives. Republican John McCain said that Russia’s aggression warrants a reassessment “of the full range of our relations,” including possible expulsion from the G-8 and rejection of Russia’s bid for membership in the World Trade Organization.

Democrat Barack Obama said Bush’s assistance package should be followed by broader reconstruction assistance, including emergency economic loans to help Georgians “rebuild their lives and their economy.” He also called for a review of multilateral and bilateral arrangements with Russia.

Angry rhetoric also came from Moscow.

Asked about Russian troops in Gori, Nogovitsyn, the deputy head of the Russian General Staff, seemed to taunt the Georgians: “The administration of this town disgracefully abandoned their posts,” he said.

The state news service Interfax quoted an analyst saying that, “Moscow will now be listened to and treated seriously. The West has . . . not listened to Russia over the past 15 years.”

Interfax also carried remarks from a spokesman for the Russian prosecutor general’s office, who said that two captured Georgian soldiers “confessed during an interrogation that the Georgian army had left behind a large number of dead and wounded soldiers as it was retreating.”

“The rhetoric used by Russia and the U.S. has been scary,” said Gennady Gudkov, deputy head of the security committee in Russia’s parliament. “All Cold War cliches have been dragged out and used again.”