An “institutionalised” China-US G2 framework could offer a “structural guarantee” for global peace in a world beset by crises, a high-profile adviser to Beijing has said. Zheng Yongnian, a noted Chinese political scientist, said the world was faced with four intertwined challenges – geopolitical conflicts, increasingly “religionised” societies, imbalances in the global economy and the fading of the UN-centred governance system.