In today’s newsletter: As world leaders gather in the UK this week, any hope of breaking the deadlock when Russia and Ukraine refuse to compromise could mean the US walks awayGood morning.Representatives from the US, Britain and France are gathering in London today to resume discussions with Ukrainian officials on a possible ceasefire in the war. Marco Rubio, the US secretary of state, was scheduled to attend but announced at the last minute he would no longer be present – the White House’s Ukraine envoy, Keith Kellogg, will be there in his place.Tariffs | The International Monetary Fund (IMF) has