President Donald Trump walked away early from his second bilateral summit with North Korea earlier this year and now his administration has pulled a similar tactic on longtime U.S. ally South Korea, potentially setting a difficult tone for diplomatic moves in the region moving forward.Amid reports that the Trump administration was asking for some $5 billion from South Korea as contribution for the U.S. military’s deployment there, the two sides came together in Seoul in hopes of extending their Cold War-era partnership. After less than two hours, however, as senior State Department negotiator James DeHart announced an end to the negotiations, telling reporters, “Unfortunately, the proposals that were put forward by the Korean team were not responsive to our request for fair and equitable burden-sharing.”His South Korean counterpart, Jeong Eun-bo, concurred that “there is a significant difference between the overall proposal from the United States and our position in principle,” at a Foreign Ministry briefing, leaving the two sides at a rare impasse as experts discussed the ramifications of an especially hard-line U.S. approach toward South Korean President Moon Jae-in’s administration.”Seoul had made clear that it considers a $5 billion figure to be too high,” Ramon Pacheco Pardo, KF-VUB Korea…