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A separate piece called for the European Union to work with it to "uphold free trade and multilateralism".

South Africa's President Cyril Ramaphosa told the meeting that a commitment to multilateralism and international law is vital to solving global crises.

"It is critical that the principles of the UN Charter, multilateralism and international law should remain at the centre of all our endeavour," he added.

South Africa's President Cyril Ramaphosa has told G20 foreign ministers that a commitment to multilateralism and international law is vital to solving global crises.

Among the significant examples Kay found were a preference for multilateralism over unilateralism after the end of the Cold War, for investments in renewable energy over fossil fuels and nuclear energy and for proactive democratic reforms rather than business as usual.