Vice President Dick Cheney, an architect of the U.S-led invasion of Iraq, on Monday hailed "phenomenal changes" in Iraq on a visit to assess the success of a troop build-up five years after the war began.

"It's good to be back in Iraq," Cheney said after an hour-long meeting with Iraqi Prime Minister Nouri al-Maliki.

Cheney, who was in Iraq 10 months ago, said the Iraqis have made legislative advances that would be vital to the country's future. He also said there was no question but there had been a dramatic improvement in security.

Cheney arrived as Republican candidate John McCain, who will be the Republican choice in November's presidential election, was meeting Iraqi leaders as part of a Senate Armed Services Committee fact-finding mission.

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"Especially significant is to be able to return this week to mark the fifth anniversary of the beginning of the campaign that liberated the people of Iraq from Saddam Hussein's tyranny," Cheney said after meeting Prime Minister Nuri al-Maliki.

Cheney said he sensed "phenomenal changes" since his last visit 10 months ago and described security gains as "dramatic."

Like McCain, Cheney is in Iraq as part of a wider tour to the Middle East. Cheney will also visit Saudi Arabia, Jerusalem, the Palestinian territories, Turkey and Oman on a nine-day tour.

Both men have been staunch supporters of a U.S. troop build-up that Washington says helped drag Iraq back from the brink of all-out sectarian civil war between majority Shi'ite and minority Sunni Muslims who were dominant under Saddam.

"I'm happy to say Americans are more and more understanding of the success of this strategy of the surge," McCain, referring to the build-up, told U.S. soldiers in volatile Mosul in Iraq's north on Sunday, according to a video released by the military.

Cheney was met on his arrival in Baghdad by General David Petraeus, the commander of U.S. forces in Iraq. He last visited Baghdad in May 2007, a month before the deployment of an extra 30,000 troops was completed.

The U.S. military says attacks across Iraq have fallen by 60 percent since last June, when the troop build-up was completed, but says a spike in violence since January is not a trend.

Neighborhood security units set up by mainly Sunni Arab tribal leaders and a ceasefire ordered by anti-U.S. Shi'ite cleric Moqtada al-Sadr for his Mehdi Army militia have also contributed to bringing down violence, the U.S. military says.

Violence remains a daily threat despite the security gains.

Roadside bombs and a minibus packed with explosives killed four people, including a policeman, and wounded 13 others in four attacks across Baghdad, police said. Neither Cheney nor McCain were in the area at the time.

PROGRESS

A senior U.S. administration official said before Cheney's trip that Middle East leaders would be interested in seeing what conclusions he draws now compared with a year ago and that it was expected he would say progress is being made.

Among the political issues Cheney is discussing with Iraq's leaders are a stalled hydrocarbon law, one of Washington's so-called reconciliation benchmarks, U.S. officials said.

The law will share revenues from Iraq's vast oil reserves, the world's third-largest, but remains blocked because of reluctance to compromise among Iraq's political blocs.

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