She revealed she did not notice anything out of place when they last spoke on Monday night.
"He just talks about all manner of ordinary things in North Korean life that we didn't know or we don't have much exposure to".
"All these speak clearly to the fact that the wild dream of the United States to bring us to our knees by means of sanctions and pressure has not changed at all but grows even more undisguised", he added.
"I didn't notice anything weird", Ms Morinaga said.
The department is providing consular assistance to Sigley's family, but it has so far been unable to confirm whether Sigley has been arrested or not.
Mr Sigley's family said on Thursday that he was usually in regular contact with them, but they had not heard from him since Tuesday.
Australia's diplomatic presence is limited in North Korea, but officials have been making urgent inquiries through Swedish diplomats.
He has described himself as the only Australian in North Korea, but there are now serious concerns for 29-year-old student Alek Sigley.
"Alek's family hope to re-establish contact with him soon".
The issue of the US Thaad missile defence system, whose deployment in the South was met by severe economic retaliation from Beijing, was also raised at the summit, a Blue House official said on condition of anonymity.
Mr Johnson said Australia had destroyed its chances of freeing Mr Sigley by shelving in 2002 plans to open an embassy in Pyongyang.
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"It certainly is a very serious set of circumstances and obviously enormous empathy for the young man's family, who I understand are in Western Australia", Mr Porter told Perth radio station 6PR.
It is "urgently seeking clarification" after the man was reportedly arrested in the North Korean capital of Pyongyang.
Alek Sigley and his wife Yuka.
Australia's Department of Foreign Affairs is now seeking confirmation on the whereabouts and well-being of 29-year-old citizen Alek Sigley, who studies literature and runs a tour company in Pyongyang, North Korea, ABC News reported.
He began looking into the possibility of attending the Kim ll-sung University - one of the top universities in North Korea.
It's not the first case of an Australian being detained in North Korea.
This will be - I don't want to get out in front of what we'll announce tomorrow, but this will be a further effort to ensure that their capacity not only to grow their economy but to evade sanctions becomes more and more hard, and it will be an important addition to our capacity to enforce sanctions against Iran to ultimately achieve the objective that we've laid out.
He also runs a company specialising in tours of North Korea and has written articles about Pyongyang's dining scene and other issues for NK News and other outlets.
He regularly updates his social media accounts but has not posted anything on either Twitter or Instagram for several days.
The unidentified North Korean foreign ministry spokesman denounced U.S. Secretary of State Mike Pompeo's remarks on Sunday that more than 80 percent of the North Korean economy has been affected by sanctions.
Speaking at a regular monthly news briefing in Beijing, a spokesman for China's Defence Ministry suggested - as China has done previously - that sanctions could be eased on North Korea if they follow United Nations resolutions.