US President Donald Trump on Friday pressed Iran to meet US demands, as Vice-President J.D. Vance travelled to Pakistan to lead high-stakes negotiations seen as a key effort to end the more than month-long Middle East conflict.The talks between the US and Iran, taking place during the agreed two-week ceasefire brokered by Pakistan, are expected to begin on Saturday morning in the Pakistani capital, Islamabad.Pakistani Prime Minister Shehbaz Sharif confirmed that leaders of both countries had...