US State Department spokesman Robert Palladino did not

  directly answer questions as to whether American diplomats have been in touch with

North Korean officials since leaving Hanoi, only saying the two sides remain in “regular contact.”

  John Bolton, Trump’s national security adviser, said Tuesday

that following the Hanoi summit, he expects the North Koreans to soon reveal “if they

‘re serious about the talks, whether they want to get back into them and fundamentally, whether they’re com

mitted to giving up their nuclear weapons program and everything associated with it. “

  ”If they’re not willing to do it, President Trump ha

s been very clear they’re not going to get relief from the crushing economic sanctions that have been

imposed on them and we’ll look at ramping those sanctions up in fact,” Bolton said.

  Trump had previously said the two sides departed amicably from the summit and left the door open for negotiations.