China has sent its most senior official in recent years to a gathering of the Group of 77 as Beijing presses ahead with its bid to have a bigger say in global institutions.
Li Xi, the Communist Party's seventh-ranked member and the chief of the top corruption watchdog, is attending the two-day meeting of the G77 Plus China in the Cuban capital Havana, which started on Friday.
Li said China wanted to work with developing countries to make global governance fairer, as "certain countries" imposed unilateral sanctions and jeopardised the interests of the Global South.
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"[We should] adhere to the original intention of being independent, self-reliant and uniting for our own strength, uphold common values for all humanity, and firmly [stand] against group confrontation and a cold war mentality," state news agency Xinhua quoted Li as saying.
"[We should] actively and resoundingly speak up in important international platforms to preside fairness and promote the UN agendas aligning with developing countries' development interest, and urge developed countries to fulfil their development aid commitments and expand the voice and representation of developing countries."
The G77 is a group of more than 130 countries within the United Nations formed to promote the economic interests of developing nations.
It includes a number of member countries targeted by US sanctions, including Iran and Cuba. China is not an official member.
Li also said that no matter how developed it became, China would always be part of the Global South.
The gathering in Havana comes just several days ahead of the annual meeting of the UN General Assembly, where a number of pressing development issues such as climate change and health will be discussed.
UN secretary general Antonio Guterres appealed to the group to "fight for a world that works for all".
"I count on your group, who have long been champions of multilateralism, to step up, to use your power, and fight: champion a system rooted in equality; champion a system ready to reverse the injustice and neglect of centuries," Guterres said.
The group was formed in 1964 and Cuba took over its rotating presidency in January.
At the opening ceremony on Friday, Cuban President Miguel Diaz-Canel said: "After all this time that the North has organised the world according to its interests, it is now up to the South to change the rules of the game."