FILE – In this Wednesday, Feb. 27, 2019, file photo, U.S. President Donald Trump shakes hands with North Korean leader Kim Jong Un in Hanoi. Trump said he walked away from his second summit with North Korean leader Kim Jong Un because Kim demanded the U.S. lift all of its sanctions, a claim that North Korea’s delegation called a rare news conference in the middle of the night to deny. (AP Photo/ Evan Vucci, File) WASHINGTON – The White House national security adviser on Sunday described President Donald Trump’s summit with North Korean leader Kim Jong Un as a success despite the lack of an agreement providing for the verifiable dismantling of the North’s nuclear sites. John Bolton, in three television interviews, tried to make that case that Trump advanced America’s national security interests by rejecting a bad agreement while working to persuade Kim to take “the big deal that really could make a difference for North Korea.” The U.S. and North Korea have offered contradictory accounts of why last week’s summit in Vietnam broke down, though both pointed to American sanctions as a sticking point. Bolton said the leaders left on good terms and that Trump made an important…