Korean relationships, which were volatile in the past, and could result in more problems for the U.S. and its allies in Asia, according to Bandow. Douglas Dillon, Professor of Government at the Harvard Kennedy School, and former director of Harvard's Belfer Center, Graham T. Allison, believed that the Hanoi summit is not a complete failure, and compared the state of affairs to the Reagan–Gorbachev era. Like Trump, Reagan also had to deal with negative public opinion regarding his dealings with the USSR, but he was able to remove all of the Soviet Union's intermediate nuclear-armed missiles with an INF deal. Compared to the USSR, North Korea is also not a normalized country, but Trump was able to directly engage with Kim Jong-un, something George W. Bush and Barack Obama were not able to do in their combined 16-year term. U.S. Senior Expert on North Korea, Frank Aum, said that future goals of the Trump administration should be the founding of smaller deals that resulted from the Hanoi summit. Deals that include the declaration of the end of the Korean War, exchange of liaison offices in both Pyongyang and Washington, some sanctions relief, and verified dismantling of some of North Korea's nuclear facilities (Nyngbyon, Punggye-ri, and Dongchang-ri) are attainable. According to Aum, Trump's "Big Deal" approach to North Korea would have been unrealistic, since it is not possible to achieve complete denuclearization in two years. He also said that some of the road-maps to establishing complete denuclearization might be the most hopeful solution. A political scientist specializing in international security, Christopher J. Watterson, argued in The Diplomat that "North Korea's willingness to give up fissile material production in Nyongbyon might reflect an intent to shift operations to Kangson, rather than an intent to cease fissile material production altogether". Reuters revealed the existence of a document handed to Kim Jong-un by Trump that may have caused the collapse of the Hanoi summit. The document and its contents were first proposed by Bolton in 2004 and—according to Washington-based expert on North Korea, Jenny Town—has been rejected more than once and "... to bring it up again ... would rather be insulting." She also said that the U.S. should have learned that this was not effective diplomacy, and shows they have not learned how to properly negotiate with North Korea. Abby Bard, a research associate for Asia policy at the Center for American Progress,