G7 warns China, NKorea over nuke buildupbr br Leaders of the world’s most powerful democracies warn China and North Korea against building up their nuclear arsenals, pivoting to major northeast Asian crises ahead of the arrival later Saturday of Ukrainian President Volodymyr Zelenskyy. The focus on Asia at the Group of Seven summit comes as leaders tighten sanctions meant to punish Moscow and change the course of its 15-month invasion of Ukraine. US President Joe Biden and Zelenskyy would have direct engagement at the summit, a day after Biden announced his support for training Ukrainian pilots on US-made F-16 fighter jets, a precursor to eventually providing those aircraft to Ukraine’s Air Force.