Hours after delivering a sombre reading at Monday's funeral of Queen Elizabeth II, Britain's new Prime Minister Liz Truss flew to stage her debut at the UN General Assembly. In New York this week, Boris Johnson's successor is due to meet US President Joe Biden and French President Emmanuel Macron -- two leaders who are antagonistic towards Truss's hard line on Brexit and Northern Ireland. Truss was appointed on September 6, in one of Queen Elizabeth II's final ceremonial acts as head of state. She died two days later, triggering 10 days of national mourning during which UK political life was suspended. The respite will prove short-lived as Truss thrusts into hard-nosed diplomacy, and as her nascent government tackles a cost-of-living crisis brought on by Russia's war in Ukraine that is hurting millions at home. She is due back in London on Thursday, a day before Finance Minister Kwasi Kwarteng delivers an emergency budget statement after the government vowed a costly scheme to cap rocketing energy bills. At the UN, Truss will seek to "spur further international action to end energy dependence on Russia, making sure the world is never in this position again", her spokesman told...