Iran's Supreme Leader Ayatollah Ali Khamenei said in a statement read by a television presenter on Wednesday that his country will not accept US President Donald Trump's call for an unconditional surrender.

In his first remarks since Friday, when he delivered a speech broadcast on state media after Israel began bombarding Iran, Khamenei said peace or war could not be imposed on the Islamic Republic.

"Intelligent people who know Iran, the Iranian nation, and its history will never speak to this nation in threatening language because the Iranian nation will not surrender," he said.