Leaders of the world’s 20 major economies called for a global pact to combat hunger, more aid to war-torn Gaza and an end to hostilities in the Mideast and Ukraine, issuing a joint declaration that was heavy on generalities but short of details on how to accomplish those goals.

The G20 summit in Rio de Janeiro, which begins Monday, is already impacted by ever-evolving geopolitical events, regardless of host Brazil’s official theme of fighting hunger, poverty and inequality.