Secretary of State Mike Pompeo traveled to North Korea, his second trip there in just over a month as a planned summit between President Donald Trump and North Korean leader Kim Jong Un approaches.

‘We will not relieve sanctions until such time as we have achieved our objectives. We’re not going to do this in small increments, where the world is coerced into relieving economic pressures.’
Secretary of State Mike Pompeo in remarks to reporters on the flight

Pompeo on Tuesday said he would meet with North Korean officials in an effort to pin down key details, including the precise location and timing of the summit and an agenda for the meeting. He also said he wanted to make clear that the U.S. goal for the outcome was long-term disarmament.

A key issue in the presummit period is the fate of American citizens detained in North Korea. Kim told Pompeo in his earlier visit to North Korea that he would consider U.S. requests for the release of the Americans in advance of the summit, planned for late May or June.

Pompeo told reporters aboard his flight that he planned to raise the issue of the three detained Americans during his trip, but had no commitments for their release.

He added it was unclear who would meet with the U.S. delegation on this occasion. “We’re prepared to meet anyone who can speak on behalf of the North Korean government and give us solid answers, so we’re prepared.”

Trump on Tuesday also said the time and location for the summit had been chosen, although Pompeo said he hoped to pin down a specific location and timing questions, such as the duration of the meetings. A State Department official aboard the flight told reporters the “possible meeting” could take place in June.

Popular on WSJ.com:

Pompeo heads to North Korea as Trump-Kim summit approaches