South Korea’s President Moon Jae-in and U.S. President Donald Trump plan to discuss North Korea during the U.N. General Assembly in New York this month, Moon’s office and the White House said on Tuesday, amid lackluster progress on the North’s nuclear issues, Reuters reported.

Moon and Trump spoke for 50 minutes by telephone on Tuesday, a day before Moon’s special envoys were due to visit Pyongyang to discuss a third summit to be held this month between the liberal South Korean leader and his North Korean counterpart.