US President Donald Trump says new negotiations with Iran will begin on Monday, after he decided to hold off on striking the Islamic republic to pursue a deal to end the war that's now entering its sixth month.Trump told reporters on Monday that the talks would cover the Strait of Hormuz — a route for global energy supplies that has become a key sticking point in the conflict — and ultimately, the de-nuclearisation of Iran.For its part, Iran said it was nearing a deal with Oman over a new route through the strait, where a tanker reported an explosion nearby on Monday, underscoring the continued volatility of the strategic waterway.The US and Iran have been at war since 28 February, when the US and Israel launched surprise strikes against Iran, though months of on-off diplomacy have led to periods of relative calm.Following a return to strikes last month, fears had mounted that the fighting could escalate once again It begins tomorrow afternoon," Trump told reporters aboard Air Force One on Sunday, without providing details of the venue or participants in the talks.The US president said he had been asked by Iran as well as US partners Saudi Arabia, the United Arab Emirates and Qatar to hold off on the strikes, which he claimed would have been "the biggest attack since World War II".Iranian media denied that Iranian officials had asked Trump not to strike.A previous ceasefire deal that included the reopening of the Strait of Hormuz fell through, and Iran has since tightened its control over the waterway.The US president said at the start of the conflict that the war was necessary to deal with Iran's nuclear program