Why were scheduled talks between the US and Iran suddenly cancelled? On Tuesday, as US vice president JD Vance was due to be flying to Pakistan for mediated talks on ending the war in Iran, Donald Trump announced on Truth Social that he was extending the ceasefire agreement, but that the US will continue to block Iranian ports.

Meanwhile, the Strait of Hormuz, a critical shipping lane through which 20% of the world’s oil, as well as critical supplies of gas, aluminium and fertiliser is transported, remains a flashpoint, with Iran attacking cargo ships attempting to get through.

Today, we speak to the BBC’s diplomatic correspondent, Paul Adams, who is in the capital of Pakistan. Plus, in response to listener demand, we speak to Charlotte Smith, the long-time presenter of the BBC’s Farming Today, about how the blocking of the Strait of Hormuz is affecting the farming and food industries globally.

Producers: Hannah Moore, Lucy Pawle and Valerio Esposito

Executive producers: James Shield and Richard Fenton-Smith

Mix: Travis Evans

Senior news editor: China Collins