The US will abandon trying to broker a Russia-Ukraine peace deal within days unless there are clear signs a truce can be reached, US Secretary of State Marco Rubio has warned. "We're not going to continue with this endeavour for weeks and months on end," Rubio said, adding that the US had "other priorities to focus on". Russia launched a full-scale invasion of Ukraine in 2022 and has placed a number of conditions on any potential ceasefire. Despite the Trump administration's initial...