IT IS SOMETIMES said, not least by President Donald Trump, that America and China are now the G2, a duo of superpowers leading the world. That is a grim thought. One has a leader who treats allies like patsies and is ripping apart the institutions that underpinned global stability for decades. The other has an authoritarian regime that bullies its neighbours and is quietly stoking foreign conflicts it could help defuse.IT IS SOMETIMES said, not least by President Donald Trump, that America and China are now the G2, a duo of superpowers leading the worldWorse, the two countries treat their…