Yemen’s Houthi rebels have said their six-month-long truce with the Saudi-led coalition is at a “dead end” as foreign powers urged the warring parties to try to save the deal, which expires Sunday. The Iran-backed rebels said in a statement that the coalition had fallen short on commitments to “ease the suffering of the Yemeni people”. “Over the past six months, we haven’t seen any serious willingness to address humanitarian issues as a top priority,” the statement read. Yemen’s brutal civil war began in 2014 when the Houthis seized the capital, Sanaa, and much of northern Yemen and forced the…