Sources tell Al Jazeera that Pakistani mediators are hopeful about a breakthrough on Iran’s nuclear programme.A high-level Pakistani delegation has travelled to Iran to hold talks focused on arranging a fresh round of negotiations between Iran and the United States, a week before their fragile truce is due to expire.Pakistan Army Chief Asim Munir is heading the delegation that arrived in Tehran on Wednesday evening, according to Iranian state media. It said he came with a new message from the US and plans to coordinate a second round of US-Iran talks, after an initial round in Islamabad ended on Sunday without a deal to end the war.Recommended Stories list of 3 itemsend of listPakistan’s Interior Minister Mohsin Naqvi is also joining mediation efforts in Tehran, while Pakistan’s Prime Minister Shehbaz Sharif is in Saudi Arabia for the first stop in a four-day Gulf tour.Pakistan’s diplomatic blitz comes as competing US and Iranian sea blockades strain tensions – and the global economy – but amid indications of progress towards a deal to end the war, which has killed 3,000 people in Iran and spiralled across the Middle East.“The urgency is being driven by the ceasefire expiring on April 22, and Pakistani officials are hoping they can get that extended,” said Al Jazeera’s Kimberly Halkett from Islamabad. “Sharif will try and convince regional partners to also use their leverage to convince the US to participate in new talks with Iran and make sure there is no diplomatic line-crossing.”Washington ‘feels good’ about potential dealThe latest mediation appears bolstered by optimistic comments from US President Donald Trump, who said the world should brace for an “amazing two days” as the war with Iran is close to over. Advertisement Trump also said his negotiators were likely to return to Pakistan, thanks largely to the “great job” …