The Iran war requires a 'serious' approach that does not change every day, Emmanuel Macron has said, in an apparent reference to US President Donald Trump's seemingly contradictory remarks about the conflict.

'This is not a show. We are talking about war and peace and the lives of men and women,' the French president told journalists upon arrival in South Korea for a state visit.

'When you want to be serious you don't say every day the opposite of what you said the day before,' Macron added. 'And maybe you shouldn't be speaking every day. You should just let things quieten down.'

Macron was responding to questions on the US-Israel war in Iran, which has now entered its second month. France and other European countries have supported some of the US operations in the region but have so far resisted getting dragged into the war.

Trump and his administration have been sending mixed messages on the conflict, suggesting at various times that a ceasefire was nearing, that the war had been won, or that the US would continue fighting.

Macron also addressed Trump's recent comments regarding NATO, arguing that alliances are valuable due to the trust behind them and that commenting on them constantly undermines their stability.

The French leader expressed that international observers are needed to monitor Iran's nuclear development and that military actions cannot resolve the long-term issues related to nuclear proliferation. Trump has been critical of France's role in the Iran conflict and mocked Macron's wife during private discussions, leading to backlash within France.

Macron rebuffed Trump's remarks about his marriage as 'neither elegant nor up to standard' and stated, 'I won't respond to them, they don’t deserve a reply.' The situation remains tense, with Iran's actions further complicating the geopolitical landscape.