WASHINGTON — An expert on Friday called on South Korea and the United States to address the "political fallout" of U.S. President Donald Trump's decision to scale back their military exercises, noting that the "unnecessary crisis" between the allies has created a roadblock to a coordinated approach toward Pyongyang. Ankit Panda, a senior fellow in the nuclear policy program at the Carnegie Endowment for International Peace, made the case in an article released by the Bulletin of the Atomic Scientists, a nonprofit research group, noting that Trump should focus on "coexistence" with North Korea rather than denuclearization should diplomacy with North Korean leader Kim Jong-un materialize. "The unnecessary crisis with South Korea caused by the president's instincts to both seek engagement with Kim without understanding North Korea's position — and to punish Seoul for its perceived distance on U.S. policy toward Iran — has created a roadblock to a coordinated approach between the two allies," he said. "If there is to be any productive engagement with Kim, it will require Washington an