US President Donald Trump has shared a message sent to him by Nato chief Mark Rutte which congratulates the president for taking "decisive action" in Iran.

"Congratulations and thank you for your decisive action in Iran, that was truly extraordinary, and something no one else dared to do. It makes us all safer," the message says.

It's not explicitly stated which action of the US president's Rutte is referring to. Over the weekend, Trump ordered a strike on Iranian nuclear sites, and in the past 24 hours has pressed both Israel and Iran to reach a ceasefire.

A screenshot showing several messages from Rutte has been shared on Trump's Truth Social platform. Nato has confirmed the messages are genuine.

The message goes on to praise Trump for pressing other Nato members to spend more on defence.

It appears to have been sent directly to the US president - but it's unclear if it was intended to be seen more widely.

Trump is on his way to a Nato summit in the Netherlands, where he will meet with Rutte and other leaders from the 32-country security bloc.