Foreign visitors have been subject to arbitrary arrest, long-term detention, and execution in North Korea.
Australia's Department of Foreign Affairs and Trade said it's investigating reports that North Korean authorities have detained Alek Sigley, who runs tours for foreign students and submits social media posts about the country.
The reports came amid thawing relations between Washington and Pyongyang following the leaders' recent exchange of letters.
USA officials have said the sanctions would stay in place unless North Korea takes significant steps toward nuclear disarmament.
North Korean officials said Wednesday it won't submit to USA -led sanctions and accused Washington of trying to "bring us to our knees".
It was ground-breaking for Sigley to be accepted by Kim Il-sung University as the first Australian student, he said, because the institution had previously rejected approaches from Petrov to accept Australian students.
In the June 14th address, the South Korean leader said "if North Korea walks on the path for dialogue, no one in the world will threaten North Korea's regime and security".
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Trump tried to go to the DMZ, where Kim and Moon held a historic first summit past year, on a 2017 visit to South Korea, but heavy fog prevented it.
The South Korean President is also set to hold his eighth summit with Trump in Seoul on Sunday. USA officials have said the sanctions will stay in place unless the Kim regime takes significant steps toward nuclear disarmament.
The North Korean Foreign Ministry issued a statement on Wednesday that proceeded as if Pompeo had been referring to North Korea with his comment about "80-plus percent" of the Iranian economy being sanctioned.
Moon had claimed to be privy to Trump and Kim's burgeoning relationship and told the press that "both sides have been engaged in dialogue in regard to a third summit".
"He is an Australian national, and not a United States citizen - so unlike Warmbier, it's unlikely that Sigley will be used by the North Korean regime" as a diplomatic tool, she said. The Trump administration is negotiating with North Korean leadership in an effort to persuade the country to abandon its nuclear weapons program.
'It would be more appropriate that a former foreign minister reach out to North Korea rather than a current, elected official.
KCNA has said Trump's letter had "excellent content" and Kim would "seriously contemplate" it, without elaborating. Moon also said talks between the two Koreas have been under way through unspecified "various channels".
"On behalf of the ANU community, I extend my concern and thoughts for his wellbeing, as well as to his family, his friends and colleagues", Vice-Chancellor Keith Nugent said in a statement.
South Korea's National Intelligence Service, the country's main spy agency, said it can not confirm the report. "Kim is willing to talk. but North Korea's position remains unchanged".