>> North Korean officials are warning that efforts towards denuclearization could be falling apart. According to US officials who spoke to Reuters, the threat came in the form of a letter to US Secretary of State Mike Pompeo. Prompting President Trump to cancel Pompeo's upcoming visit to North Korea. Reuters' correspondent David Brunnstrom has more details.
>> This appears to have been a letter that was sent by the chief North Korean negotiator which suggested that progress might be difficult if not impossible to make.>> Back in June, at the first summit between a sitting US President and a North Korean leader, Kim Jong-un agreed broad terms to work toward denuclearization of the Korean peninsula.
And Trump made a surprise announcement to suspend joint military drills with the South as a concession to the North. We will be stopping the war games, which will save us a tremendous amount of money.>> But since then the North has shown no willingness to unilaterally give up its weapons as Trump demanded.
And Tuesday, US Defense Secretary Jim Maddis made clear, military drills were back in play.>> As you know, we took the step to suspend several of the largest exercises as a good faith measure coming out of the Singapore Summit. We have no plans at this time to suspend any more exercises.
>> The North Koreans have always portrayed US military exercises, joint military exercises with the South Koreans as hostile actions, essentially rehearsals for invasions or otherwise of North Korea.>> The major drills in the region are not expected to pick up again until next spring, which could give both sides time to bring negotiators back to the table.