US President Donald Trump has reignited his public feud with Ukrainian President Volodymyr Zelensky, declaring that Ukraine needs a new president amid growing tensions over the war with Russia. Trump has criticised Zelensky's handling of peace negotiations and warned Kyiv against striking Russian oil refineries, arguing that attacks on energy infrastructure could disrupt global fuel supplies and hurt American farmers and businesses. The explosive remarks have raised fresh questions about Washington's support for Ukraine, the future of US-Ukrainian relations and the prospects for a negotiated end to the war. Is Trump's latest outburst a pressure tactic to force Kyiv towards a deal, or a sign of a deeper rift between the two leaders?