FILE – In this Dec. 3, 1989, file photo, U.S. President George H. Bush, left, and Soviet President Mikhail Gorbachev, right, speak after Bush arrived on the Soviet cruise liner Maxim Gorky, in Malta. The notion of a substantive sit-down between North Korean leader Kim Jong Un and U.S. President Donald Trump – the most gazed-upon figures of this moment in the planet’s history –is a staggering prospect and a potential logistical nightmare if the two countries ever tried to make it happen. (AP/RSS Photo/Ron Edmonds, File)