UPDATE 1-Trump says he would be disappointed if North Korea resumed testing

U.S. President Donald Trump said on Friday he would be disappointed if North Korea were to resume weapons testing, and reiterated that he had a good relationship with North Korean leader Kim Jong Un.

"I would be surprised in a negative way if he did anything that was not per our understanding. But we'll see what happens," Trump told reporters at the White House. "I would be very disappointed if I saw testing." The Republican president's comments come after a second summit between him and Kim collapsed last week over differences on U.S. demands for denuclearization and North Korea's demand for sanctions relief.

Two U.S. think-tanks and Seoul's spy agency said this week that North Korea was rebuilding a rocket launch site, and there have been reports of new activity at a factory that produced North Korea's first intercontinental ballistic missiles capable of reaching the United States. (Reporting by Roberta Rampton and Lisa Lambert Writing Susan Heavey and David Brunnstrom Editing by Chizu Nomiyama)