The former United Nations chief also discounted hopes for a Russian-led plan to stabilize Syria and starkly dismissed chances for Israeli-Palestinian peace under their current leaders.
Flanked by three fellow members of his "Elders" group -- including a former president, prime minister and UN peace envoy for the planet's worst crises - Annan implored "mainstream leaders" in the West and elsewhere to counter the rising tide of nationalism.
Annan described Trump as "one of this year's leaders who come into town, who come into office and believe they have all the answers," scapegoating Mexico or China for longer-term structural problems -- like a welder who is paid USD 25 an hour being replaced by a robot that requires no health care -- and brushing aside international efforts to tackle security to migration challenges.
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US leadership "is being weakened now by the statements we hear out of Washington, the uncertainty and the fact that the messages keep changing and sometimes rather fast," said Annan, the 2001 Nobel Peace laureate.
The Elders' fears about populism extend to Europe.
While 39-year-old centrist Emmanuel Macron defeated Marine Le Pen in France's presidential election last weekend, the extreme-right candidate received twice as many votes as her father did 15 years ago, Robinson noted.
"In Holland, it's worse," said Brahimi, bemoaning that people took comfort from a vote that returned moderates to power but showed far-right gains.
Annan, who like Brahimi failed as a UN envoy to halt Syria's civil war, now in its seventh year, expressed little faith in a recent agreement negotiated by Russia, Turkey and Iran to set up "de-escalation zones" in the Arab country.
"On the question of the zones, I'm not sure how it's going to work," Annan said, citing "many players in that limited theater" and the risk of a deadly accident, especially as some appear "ready to torpedo any agreement you make."
The North is racing toward the capability to threaten the US mainland with a nuclear warhead, and the Trump administration has delivered various suggestions for eliminating the danger, including possible pre-emptive strikes.
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