World leaders pose for family photo as meeting in Buenos Aires gets underway Crown Prince Mohammed bin Salman holds talks with a number world leaders on the sidelines BUENOS AIRES: Leaders from the world’s leading economies gathered for the G20 summit in the Argentinian capital on Friday to discuss development, infrastructure and investment. Saudi Arabia’s delegation was headed by Crown Prince Mohammed bin Salman, who was greeted by world leaders including Vladimir Putin and Emmanuel Macron. The summit is overshadowed by issues including the US-China trade dispute to the conflict over Ukraine. Also expected to loom are tensions between the United States and Europe.Thousands of demonstrators are flooding a downtown avenue in Buenos Aires to protest against the G20 summit, AP reported. Activists from France, Germany, Italy and several Latin American nations are taking part alongside Argentines in a demonstration organized by left-leaning groups and labor unions. About 22,000 police officers and other security forces are guarding the world leaders.Saudi Arabia"s energy minister Khalid Al-Falih has met with the Russian energy minister, Alexander Novak to discuss oil output.Saudi Arabia"s energy minister Khalid Al-Falih will meet with his Russian counterpart Alexander Novak during the summit to discuss an oil output in 2019, the Russian news agency RIA reported. Novak also said that Russia"s 2019 oil output is expected to be at the same level as this year but could be adjusted, depending on a deal between OPEC and non-OPEC members. Producer group OPEC and its allies are meeting in Vienna next week to discuss oil production. Donald Trump says "the sole reason" he canceled a meeting with Vladimir Putin at the G20 was because of Russia seizing Ukrainian ships 15:55 G20 leaders including the presidents of the United States, Russia and China opened summit talks on Friday. Argentinian President Mauricio Macri convened the two-day summit in Buenos Aires with a call for member nations to support international cooperation and multilateralism. He added that it will be an agenda "centered on people. Russian President Vladimir Putin on Friday denounced the “vicious” use of sanctions and trade protectionism, in a veiled swipe at Donald Trump at the G20 summit. “One cannot help but see a dishonest competition increasingly taking the place of honest dialogue based on equality among states,” Putin told leaders of emerging economies as the summit opened in Buenos Aires. “A vicious practice of returning to illegal, unilateral sanctions and protectionist measures is spreading, going around the UN Charter, the rules of the WTO and internationally recognized legal norms,” Putin said. Putin said that the result was “an extremely negative effect on the spirit of international cooperation,” discouraging business. 11:36 British Prime Minister Theresa May will hold a bilateral meeting with Saudi Arabia’s Crown Prince Mohammed bin Salman at the G20 summit in Argentina, her spokesman confirmed on Friday. The meeting will take place at 20:00 GMT. Read More: UK PM May to hold bilateral meeting with Saudi crown prince 9:50 The leaders of the United States, Mexico and Canada on Friday signed a huge regional trade deal to replace the old NAFTA, denounced by President Donald Trump as a killer of US jobs. “This is a model agreement that changes the trade landscape forever,” Trump said at the signing ceremony in Buenos Aires, on the sidelines of the G20 leaders’ summit. But he insisted that the US-Mexico-Canada Agreement, or USMCA, was an “incredible milestone” that would aid US workers, especially in the auto industry, while putting in place “intellectual property protection that will be the envy of nations all around the world.” Canadian Prime Minister Justin Trudeau was less effusive about the renegotiated pact, but said the USMCA would resolve the threat of “serious economic uncertainty” that “would have gotten more damaging.” Mexican President Pena Nieto, on his last day in office, called the revamped version of NAFTA important in shoring up “the view of an integrated North America with the firm belief that together we are stronger and more competitive.” Read More: Trump joins leaders of Canada, Mexico to sign new trade pact 3:05 Saudi Crown Prince Mohammed bin Salman and Indian Prime Minister Narendra Modi met in Argentina and discussed cooperation between the two countries in security, energy and investments, the Saudi Press Agency (SPA) said on Friday.The two leaders, who are attending the G20 Summit in Buenos Aires, also discussed Saudi Arabia’s readiness to supply India with all its needs of oil and petroleum products and Saudi oil giant Aramco’s investments in the fields of oil refining and oil storage in India, SPA said. Read More: Saudi crown prince and Indian PM meet in Buenos Aires