South Korean President Moon Jae In is considering meeting with U.S. President Donald Trump prior to the planned historic U.S.-North Korea summit talks to take place by early June, the South Korean presidential office said Wednesday.

The Moon-Trump talks are expected around mid-May, a high-level Blue House official said. Chung Eui Yong, chief of South Korea's presidential National Security Office, met John Bolton, U.S. national security adviser to Trump, in the United States on Tuesday to discuss the plan.

According to the presidential office, Moon and Trump will speak over the telephone immediately after the inter-Korean summit to be held Friday to discuss the outcome of the meeting.

The United States will be closely watching what happens at the inter-Korean summit, which will serve as a prelude to the talks between Trump and North Korean leader Kim Jong Un in the first summit of its kind.

Hopes have emerged of a possible breakthrough in the nuclear standoff between Washington and Pyongyang after the Korean Peninsula has appeared to be teetering on the brink of conflict due to North Korea's repeated nuclear and missile tests in defiance of the international community.