Brazil's foreign minister criticized the "paralysis" of the UN Security Council on the conflicts in Gaza and Ukraine as he opened a G20 meeting on Wednesday where the international community's deep divisions are on display.

"Multilateral institutions are not properly equipped to deal with the current challenges, as has been demonstrated by the Security Council's unacceptable paralysis on the ongoing conflicts," Foreign Minister Mauro Vieira told the opening session of a two-day meeting of top diplomats from the world's 20 biggest economies.