Malcolm Turnbull has dismissed a letter from North Korea to Australia as a rant about Donald Trump.
The prime minister confirmed receipt of the correspondence, also sent to other governments around the world, noting it didn't refer to Australia specifically.
"It's basically a rant about how bad (US President) Donald Trump is," he told Neil Mitchell on 3AW radio on Friday.
"The fact of the matter is North Korea is the one that is in breach of UN Security Council resolutions."
Mr Turnbull believes the letter is a sign sanctions are working and North Korea is starting to "feel the squeeze".
Foreign Minister Julie Bishop earlier revealed the September 28 letter from North Korea's foreign affairs committee arrived via Australia's embassy in Jakarta.
The letter lashes President Trump's nuclear threats, saying his approach to foreign policy was "the height of American way of thinking that it is the best if the US is well-off at the expense of the whole world".
"If Trump thinks that he would bring the [Democratic People's Republic of Korea], a nuclear power, to its knees through nuclear war threat, it will be a big miscalculation and an expression of ignorance," the letter reads.
North Korea believes countries "loving independence, peace and justice" will be vigilant "against the heinous and reckless moves of the Trump administration trying to drive the world into a horrible nuclear disaster".
Ms Bishop told Fairfax it was the first time Australia had received a letter from North Korea, which typically communicates through its state-run news agency KCNA, as it did on the weekend.
Pyongyang at the weekend also called out Australia for its outspokenness in calling for an end to its nuclear weapons program, warning it if it continues Australia "will not be able to avoid a disaster".
At the time Ms Bishop, who was in South Korea with Defence Minister Marise Payne for talks hit back and said Australia was not a "primary target".
