South Korea, US to work closely on June 12 summit - Reuters

South Korean President Moon Jae-in and US President Donald Trump held a telephonic conversation on Sunday for about twenty minutes, and exchanged their views on North Korea’s recent reactions, as they prepare for upcoming June 12 Summit.

South Korea’s presidential official noted: “The two leaders will work closely and unwaveringly for the successful hosting of the North Korea- U.S. summit set on June 12, including the upcoming South Korea-U.S. summit.” 

Moon and Trump are set to meet on Tuesday in Washington before North Korean leader Kim Jong Un meets with Trump on June 12 in Singapore.