In an address to business leaders and journalists in Dubai, Blair said combating extremism and the violence it foments was the greatest challenge of the 21st century. He said the lesson he had drawn from his five-day Mideast trip was "startlingly real, clear and menacing."
"There is a monumental struggle going on worldwide between those who believe in democracy and moderation, and forces of reaction and extremism," Blair said.
"We have to wake up. These forces of extremism — based on a warped and wrongheaded misinterpretation of Islam — aren't fighting a conventional war. But they are fighting one, against us — and 'us' is not just the West, still less simply America and its allies," Blair said.
"We must therefore mobilize our alliance of moderation in the region and outside of it to defeat the extremists."
Blair has repeated that message throughout his trip — in Turkey, Egypt, Iraq, Israel, the Palestinian territories and the United Arab Emirates.
He identified his chief foe in the region — the government of Iranian President Mahmoud Ahmadinejad. Iran is a sponsor of the Palestinian militant group Hamas and Lebanon's Hezbollah. Western countries claim Tehran is seeking to develop nuclear weapons, and Blair has accused Iran of backing Shiite insurgents in Iraq.
Blair said there were "elements of the government of Iran, openly supporting terrorism in Iraq to stop a fledgling democratic process; trying to turn out a democratic government in Lebanon; flaunting the international community's desire for peace in Palestine — at the same time as denying the Holocaust and trying to acquire nuclear weapons capability; and yet a large part of world opinion is frankly almost indifferent. It would be bizarre if it weren't deadly serious.
"We must recognize the strategic challenge the government of Iran poses," Blair added. "Not its people, possibly not all its ruling elements, but those presently in charge of its policy."
Blair's language differed slightly from excerpts of the speech released in advance by Blair's office, which called Iran a "strategic threat."
Each stop on the tour played a role in Blair's vision of an "arc of moderation" that could work to solve the Israeli-Palestinian conflict and defuse the anger that helps fuel international terrorism. He backed Turkey's bid to join the European Union, praised Egypt's role in mediating between Israel and the Palestinians, and urged support for the fragile Iraqi government of Prime Minister Nouri al-Maliki.
On Tuesday, he praised the oil-rich United Arab Emirates and its booming commercial hub, Dubai, as a model of economic openness that could set an example for the wider Arab world — even claiming the UAE's model "is what Basra or Gaza could be, were there people not so savagely let down by the politics of their countries."
He said the fate of the Middle East, "for good or ill," would be felt around the world.
While Blair's rhetoric was strong, the concrete achievements of the trip have been few.
Blair called for an "early meeting" between Palestinian President Mahmoud Abbas and Israeli Prime Minister Ehud Olmert, the relaunch of the peace process and support to bolster Abbas' authority in his struggle with the Islamic militant group Hamas. But he announced no new commitments or agreements on that front.
Blair, who has said he will step down by mid-2007, is on one of the last big foreign tours of his 10-year premiership, seeking to cement a foreign-policy legacy that goes beyond his role as the chief U.S. ally in Iraq.
A report released Tuesday by the influential Chatham House think-tank concluded that Blair's foreign policy ambitions have stalled because he is unable to exert real influence on the White House, despite offering the United States almost a decade of unflinching support.