President Donald Trump would seek a "complete, irreversible and verifiable" denuclearisation of the Korean Peninsula during his summit with North Korean leader Kim Jong-un in Singapore on June 12, the White House has said.
Hwang, 51, has spent much of his adult life campaigning for his father's release.
South Korean President Moon Jae-in's administration is conducting its own efforts to normalize ties on the divided peninsula and secure lasting peace. In 2017, Kim's regime conducted a slew of missile tests, enraging the worldwide community and raising tensions with both South Korea and the U.S. to new heights.
But both Washington and Seoul - longtime treaty allies - cooperate closely and also confer with the North's larger neighbor China, which has a stake in the outcome.
At a party meeting last month when Kim proclaimed the development of the North's nuclear force complete and promised no more nuclear or missile tests, he called its arsenal "a powerful treasured sword for defending peace".
"We had good conversations about the histories of our two nations, the challenges that we have had between us", Pompeo said during Friday's news conference with South Korea's visiting foreign minister, Kang Kyung-wha.
"Kim Jong-un and North Korean diplomats directly state that this process is quite lengthy and requires security guarantees for North Korean statehood", Lobov said.
During his surprise visit to North Korea this week, Pyongyang released three United States detainees.
On September 21, 2017, Washington unveils a raft of tough sanctions to curb North Korea's nuclear and ballistic missile programme. "I don't think that we were sure we were going to get these prisoners in the first place", Speaker Paul Ryan (R-WI) told reporters, "So I think we should clearly give the president some leeway on preparing for this summit".
As the Trump-Kim summit nears, there are several concerns.
Speaking through an interpreter, Kim Dong-chul told the packed crowd of media that the situation was "like a dream", adding, "We are very, very happy".
"But we got, up front, our people home".
The allure of economic help could be enough for Kim to accept terms to denuclearize, as Pompeo said that there's a chance that North Korea and the USA could become "partners", according to the Los Angeles Times.
One of the world's wealthiest countries per-capita, the island state of 5.6 million people has an advanced military, robust security infrastructure, and is considered one of the safest and least corrupt places on earth.
"I will do my best to let exchanges between the South and the North flow without stopping, " Moon said.
Former presidents Bill Clinton and Jimmy Carter visited after leaving office.
But the North's planes can pick up extra fuel when they fly to China and Russian Federation for commercial operations, and worldwide security experts believe the North may have been stockpiling the fuel which it has also used for its missile programme.
And, more than two decades and multiple provocative weapons tests after the last accord, the threat from Pyongyang has only grown.
Journalists asked Pompeo what such a denuclearization would look like and if it meant carrying out inspections in North Korean nuclear plants.