U.S. President Donald Trump said Thursday he is disappointed with North Korean leader Kim Jong-un over reports the regime is rebuilding a missile facility.

Trump was asked by reporters whether he is disappointed amid continued reports that North Korea is reassembling the Sohae satellite launching site it began to dismantle last year.

"A little disappointed. Little bit," he said during a meeting with the Czech prime minister at the White House. "We'll see. We'll let you know in about a year."

Trump and Kim held their second summit in Hanoi, Vietnam, on Feb. 27 and 28 but failed to reach an agreement on dismantling the North's nuclear weapons program.

The summit was cut short after the sides clashed over the scope of North Korea's denuclearization and the U.S.'s offer of sanctions relief.

Two U.S. monitors -- 38 North and the Center for Strategic and International Studies -- have released two reports each this week on the apparent reconstruction activity at Sohae.

In their latest reports Thursday, which cited commercial satellite imagery from a day earlier, both said the facility appeared to have been rebuilt to normal operational status.

The U.S. State Department declined to comment on the analyses, but kept the door open to further dialogue.

"We're ready," department deputy spokesperson Robert Palladino said during a press briefing. "We remain ready to engage North Korea in a constructive negotiation."

Asked about the first set of reports, Trump said Wednesday that he would be "very, very disappointed" with Kim if they were true.(Yonhap)

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