North Korea has a long history of influence in the Middle East, much of which is military-based. Its regional allies, including Iran, are closely watching the Singapore summit.
WATCH: North Korea’s Mideast allies watch Trump-Kim summit closely
Iranian President Hasan Rouhani (C) and a top North Korean leader, Kim Yong Nam arrive at the Iran presidency office in Tehran, Aug. 3, 2013. (AP/Ebrahim Noroozi)