Demonstrators wait for the beginning of a protest titled "Welcome to hell" against the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Michael Probst)
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HAMBURG, Germany (AP) - U.S. President Donald Trump and other leaders of the Group of 20 top industrial and developing countries arrived Thursday in Hamburg as police in Germany's second-biggest city braced themselves for a major protest by anti-globalization activists.
German Chancellor Angela Merkel said she hoped the G-20 leaders meeting Friday and Saturday would be able to find "compromises and answers" on a wide range of issues.
Merkel said leaders would address regulating financial markets, fighting terrorism and pandemics and combatting climate change, among other issues. She said "free, rule-based and fair trade" will be an important issue.
"You can imagine that there will be discussions that will not be easy," she said. "Globalization can be a win-win situation. It must not always be that there are winners and losers."
The northern German port city boosted its police force with reinforcements from around the country for the summit, and has 20,000 officers on hand to patrol Hamburg's streets, skies and waterways.
More than 100,000 protesters are expected in the city for the summit, with some 8,000 considered part of Europe's violent left-wing scene, according to police.
Ahead of the summit, a Thursday evening demonstration is planned, which organizers have titled as "G-20: Welcome to Hell."
While protests so far have been largely calm, city police chief Ralf Martin Meyer told ZDF television: "We are skeptical as to whether this evening and tonight will remain peaceful."
Demonstrators have promised massive protests against Trump, Russian President Vladimir Putin and Turkish President Recep Tayyip Erdogan, three of the more controversial guests at the summit. A large sign in a shop window near the summit venue featured pictures of the three with the slogan: "We don't want that!"
A large banner hanging from a building overlooking the congress center where the leaders will meet said: "G20 Members: Respect the rule of law!"
Canadian Prime Minister Justin Trudeau, Chinese President Xi Jinping and South African President Jacob Zuma were among the first to arrive on Thursday, while Trump joined in the late afternoon, flying in from a stop in Warsaw.
For the anti-globalization protest Thursday night, organizers said they were "calling on the world to make Hamburg a focal point of the resistance against the old and new capitalist authorities."
Overnight, 10 cars were set ablaze outside a Hamburg Porsche dealership, which police are investigating as possibly summit-related.
Many other groups are calling for peaceful protests, and are pushing the G-20 leaders for action on climate change, to address economic disparities in the world and a wide array of other issues. Some are even calling for the dissolution of the G-20 itself so the United Nations becomes the platform for such discussions.
In the wake of Trump's recent decision to pull out of the Paris deal fighting climate change, the battle against global warming promises to feature prominently in discussions at the summit.
Merkel has rejected calls from some to push for a strong "G-19" statement - without the U.S. - on climate change. That is something that Zhu Guangyao, a Chinese deputy finance minister, told reporters Thursday that Beijing also did not support.
"The policies produced by the G-20 should be by the consensus of all member states," he said. "No one should be excluded."
Still, he added, "China will firmly promote its policies taking more measures against climate change."
Activists are expressing concern, however, that the draft language being worked on for the closing G-20 communique apparently calls for a "global approach" on climate change, which they fear could weaken national responsibilities.
On trade, Putin wrote in a guest article for Germany's Handelsblatt newspaper Thursday that "politically motivated" sanctions were being used as a form of protectionism.
"Limits by one-sided, politically motivated sanctions on investment, trade and particularly technology transfer are becoming its hidden form," the Russian leader wrote.
The European Union and United States have imposed sanctions on Russia over its actions in Ukraine - for annexing the Crimean Peninsula in 2014 and for supporting separatists fighting the government in eastern Ukraine - a conflict that has cost 10,000 lives since April 2014.
Putin, however, wrote that such sanctions lead nowhere. He said they "contradict the G-20 principles" of working together in the interests of all countries.
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Geir Moulson contributed to this report.
Sophie Gregoire-Trudeau, son Hadrien, and Canada's Prime Minister Justin Trudeau, from left, arrive for the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Michael Sohn)
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A demonstrator lights smoke markers on top of the Rote Flora squat during a protest against the G-20 summit in Hamburg, northern Germany, Wednesday, July 5, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader)
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A demonstrator holds a poster with a photo of German Chancellor Angela Merkel and the writing 'festival of democracy with special guests' as a dancing protest against the G-20 summit passes by the Rote Flora squat in Hamburg, northern Germany, Wednesday, July 5, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader)
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Canada's Prime Minister Justin Trudeau, right, his wife Sophie Gregoire-Trudeau, left, and their son Hadrien arrive for the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Markus Schreiber)
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South African President Jacob Zuma, left, and his wife Thobeka Madiba Zuma arrive for the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Markus Schreiber)
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Chinese President Xi Jinping, left, and his wife Peng Liyuan arrive for the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Michael Sohn)
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Argentine President Mauricio Macri, left, and his wife Juliana Adawa arrive for the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Markus Schreiber)
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President Donald Trump and first lady Melania Trump wave as they board Air Force One for a trip to Hamburg for the G20 Summit, Thursday, July 6, 2017, in Warsaw. (AP Photo/Evan Vucci)
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U.S. President Donald Trump, left, and German Chancellor Angela Merkel pose for a photograph prior to a bilateral meeting on the eve of the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader, pool)
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Japanese Prime Minister Shinzo Abe, center left, and his wife Akie Abe, center right, arrive for the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (Bernd von Jutrczenka/dpa via AP)
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Japanese Prime Minister Shinzo Abe, center left, and his wife Akie Abe, center right, arrive for the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (Bernd von Jutrczenka/dpa via AP)
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Helicopters_ one of the them carrying U.S. President Donald Trump_ fly over the Elbphilharmonie concert hall in Hamburg, northern Germany, Thursday, July 6, 2017 the day before the start of the G-20 summit. (Marcus Brandt/dpa via AP)
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Demonstrators gather for a protest against the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Michael Probst)
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German Chancellor Angela Merkel, right, shakes hand with Australian Prime Minister Malcolm Turnbull prior to a bilateral meeting on the eve of the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (Michael Kappeler/pool photo via AP)
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A demonstrator takes a selfie when waiting for a protest against the G-20 summit to begin in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Michael Probst)
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German Chancellor Angela Merkel, right, poses for a photograph with Australian Prime Minister Malcolm Turnbull prior to a bilateral meeting on the eve of the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader, pool)
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U.S. President Donald Trump, left, and German Chancellor Angela Merkel pose for a photograph prior to a bilateral meeting on the eve of the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader, pool)
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U.S. President Donald Trump, left, and German Chancellor Angela Merkel pose for a photograph prior to a bilateral meeting on the eve of the G-20 summit in Hamburg, northern Germany, Thursday, July 6, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader, pool)
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